feat: implement real email sending via lettre + Vault credentials

- Replace EmailService::send_email stub with full lettre SMTP implementation
- Vault resolution chain: bot-specific → default bot → system fallback
- Seed Vault prod with default email config (contato@pragmatismo.com.br)
- Update all call sites to pass bot_id for Vault lookup
- Support attachments via lettre MultiPart/Attachment API
- Remove unused imports and dead code

src/basic/keywords/hearing/talk.rs

@@ -57,7 +57,6 @@ pub async fn execute_talk(
         let mut wa_response = response_clone;
         wa_response.user_id = target_user_id;
 
-        let pool = state.conn.clone();
         let bot_id = user_session.bot_id;
         
         tokio::spawn(async move {

src/basic/keywords/import_export.rs

@@ -234,7 +234,6 @@ fn resolve_file_path(
         return Ok(file_path.to_string());
     }
 
-    let work = get_work_path();
     let work = get_work_path();
     let data_dir = state
         .config

src/basic/keywords/send_mail.rs

@@ -353,6 +353,7 @@ async fn execute_send_mail(
                 to,
                 subject,
                 body,
+                user.bot_id,
                 if attachments.is_empty() {
                     None
                 } else {

src/basic/keywords/universal_messaging.rs

@@ -296,7 +296,7 @@ pub async fn send_message_to_recipient(
             send_web_message(state.clone(), &recipient_id, message).await?;
         }
         "email" => {
-            send_email(state.clone(), &recipient_id, message)?;
+            send_email(state.clone(), user.bot_id, &recipient_id, message)?;
         }
         _ => {
             error!("Unknown channel: {}", channel);
@@ -346,7 +346,7 @@ async fn send_file_with_caption_to_recipient(
             send_web_file(state, &recipient_id, file_data, caption).await?;
         }
         "email" => {
-            send_email_attachment(state, &recipient_id, file_data, caption)?;
+            send_email_attachment(state, user.bot_id, &recipient_id, file_data, caption)?;
         }
         _ => {
             return Err(format!("Unsupported channel for file sending: {}", channel).into());
@@ -663,6 +663,7 @@ async fn send_web_file(
 
 fn send_email(
     state: Arc<AppState>,
+    bot_id: uuid::Uuid,
     email: &str,
     message: &str,
 ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
@@ -671,13 +672,13 @@ fn send_email(
         use crate::email::EmailService;
 
         let email_service = EmailService::new(state);
-        email_service.send_email(email, "Message from Bot", message, None)?;
+        email_service.send_email(email, "Message from Bot", message, bot_id, None)?;
         Ok(())
     }
 
     #[cfg(not(feature = "mail"))]
     {
-        let _ = (state, email, message);
+        let _ = (state, bot_id, email, message);
         error!("Email feature not enabled");
         Err("Email feature not enabled".into())
     }
@@ -685,6 +686,7 @@ fn send_email(
 
 fn send_email_attachment(
     state: Arc<AppState>,
+    bot_id: uuid::Uuid,
     email: &str,
     file_data: Vec<u8>,
     caption: &str,
@@ -698,6 +700,7 @@ fn send_email_attachment(
             email,
             "File from Bot",
             caption,
+            bot_id,
             file_data,
             "attachment",
         )?;
@@ -706,7 +709,7 @@ fn send_email_attachment(
 
     #[cfg(not(feature = "mail"))]
     {
-        let _ = (state, email, file_data, caption);
+        let _ = (state, bot_id, email, file_data, caption);
         error!("Email feature not enabled for attachments");
         Err("Email feature not enabled".into())
     }

src/core/secrets/mod.rs

@@ -859,6 +859,50 @@ impl SecretsManager {
         Ok(self.get_secret(&format!("{}/oauth/{}", path, provider)).await.ok())
     }
 
+    // ============ BOT EMAIL RESOLUTION (bot → default bot → system) ============
+
+    /// Get email config for a specific bot with inheritance chain:
+    /// 1. Bot-specific: `gbo/bots/{bot_id}/email`
+    /// 2. Default bot: `gbo/bots/default/email`
+    /// 3. System-wide: `gbo/email`
+    pub fn get_email_config_for_bot_sync(&self, bot_id: &Uuid) -> (String, u16, String, String, String) {
+        let bot_path = format!("gbo/bots/{}/email", bot_id);
+        let default_path = "gbo/bots/default/email".to_string();
+        let self_owned = self.clone();
+        let (tx, rx) = std::sync::mpsc::channel();
+
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Builder::new_current_thread()
+                .enable_all()
+                .build();
+            let result = if let Ok(rt) = rt {
+                rt.block_on(async move {
+                    if let Ok(s) = self_owned.get_secret(&bot_path).await {
+                        return Some(s);
+                    }
+                    if let Ok(s) = self_owned.get_secret(&default_path).await {
+                        return Some(s);
+                    }
+                    self_owned.get_secret(SecretPaths::EMAIL).await.ok()
+                })
+            } else {
+                None
+            };
+            let _ = tx.send(result);
+        });
+
+        if let Ok(Some(secrets)) = rx.recv() {
+            return (
+                secrets.get("smtp_host").cloned().unwrap_or_default(),
+                secrets.get("smtp_port").and_then(|p| p.parse().ok()).unwrap_or(587),
+                secrets.get("smtp_user").cloned().unwrap_or_default(),
+                secrets.get("smtp_password").cloned().unwrap_or_default(),
+                secrets.get("smtp_from").cloned().unwrap_or_default(),
+            );
+        }
+        (String::new(), 587, String::new(), String::new(), String::new())
+    }
+
     // ============ TENANT-AWARE METHODS (org_id -> tenant -> secrets) ============
 
     /// Get database config for an organization (resolves tenant from org, then gets infra)

src/email/types.rs

@@ -1,4 +1,7 @@
-use axum::{http::StatusCode, response::{IntoResponse, Response}};
+use axum::{
+    http::StatusCode,
+    response::{IntoResponse, Response},
+};
 use chrono::{DateTime, Utc};
 use diesel::prelude::*;
 use diesel::sql_types::{Bool, Integer, Nullable, Text, Timestamptz, Uuid as DieselUuid, Varchar};
@@ -305,13 +308,163 @@ impl EmailService {
         Self { state }
     }
 
-    pub fn send_email(&self, to: &str, _subject: &str, _body: &str, _attachments: Option<Vec<String>>) -> Result<(), String> {
-        log::warn!("EmailService::send_email not fully implemented. to: {}", to);
-        Ok(())
+    pub fn send_email(
+        &self,
+        to: &str,
+        subject: &str,
+        body: &str,
+        bot_id: Uuid,
+        _attachments: Option<Vec<String>>,
+    ) -> Result<String, String> {
+        use lettre::message::{header::ContentType, Message};
+        use lettre::transport::smtp::authentication::Credentials;
+        use lettre::{SmtpTransport, Transport};
+
+        let secrets = crate::core::secrets::SecretsManager::from_env()
+            .map_err(|e| format!("Vault not available: {}", e))?;
+        let (smtp_host, smtp_port, smtp_user, smtp_pass, smtp_from): (
+            String,
+            u16,
+            String,
+            String,
+            String,
+        ) = secrets.get_email_config_for_bot_sync(&bot_id);
+
+        if smtp_from.is_empty() {
+            log::warn!(
+                "No SMTP from address configured in Vault for bot {}",
+                bot_id
+            );
+            return Err("SMTP not configured: set email credentials in Vault".into());
         }
 
-    pub fn send_email_with_attachment(&self, to: &str, _subject: &str, _body: &str, _file_data: Vec<u8>, _filename: &str) -> Result<(), String> {
-        log::warn!("EmailService::send_email_with_attachment not fully implemented. to: {}", to);
+        let email = Message::builder()
+            .from(
+                smtp_from
+                    .parse()
+                    .map_err(|e| format!("Invalid from address: {}", e))?,
+            )
+            .to(to
+                .parse()
+                .map_err(|e| format!("Invalid to address: {}", e))?)
+            .subject(subject)
+            .header(ContentType::TEXT_HTML)
+            .body(body.to_string())
+            .map_err(|e| format!("Failed to build email: {}", e))?;
+
+        let mailer = if !smtp_user.is_empty() && !smtp_pass.is_empty() {
+            let creds = Credentials::new(smtp_user, smtp_pass);
+            SmtpTransport::relay(&smtp_host)
+                .map_err(|e| format!("SMTP relay error: {}", e))?
+                .port(smtp_port)
+                .credentials(creds)
+                .build()
+        } else {
+            SmtpTransport::relay(&smtp_host)
+                .map_err(|e| format!("SMTP relay error: {}", e))?
+                .port(smtp_port)
+                .build()
+        };
+
+        mailer
+            .send(&email)
+            .map_err(|e| format!("Failed to send email: {}", e))?;
+
+        info!("Email sent to {} via {} (bot {})", to, smtp_host, bot_id);
+        Ok(format!("sent-{}", bot_id))
+    }
+
+    pub fn send_email_with_attachment(
+        &self,
+        to: &str,
+        subject: &str,
+        body: &str,
+        bot_id: Uuid,
+        file_data: Vec<u8>,
+        filename: &str,
+    ) -> Result<(), String> {
+        use lettre::message::{
+            header::ContentType, Attachment, Body, Message, MultiPart, SinglePart,
+        };
+        use lettre::transport::smtp::authentication::Credentials;
+        use lettre::{SmtpTransport, Transport};
+
+        let secrets = crate::core::secrets::SecretsManager::from_env()
+            .map_err(|e| format!("Vault not available: {}", e))?;
+        let (smtp_host, smtp_port, smtp_user, smtp_pass, smtp_from): (
+            String,
+            u16,
+            String,
+            String,
+            String,
+        ) = secrets.get_email_config_for_bot_sync(&bot_id);
+
+        if smtp_from.is_empty() {
+            return Err("SMTP not configured: set email credentials in Vault".into());
+        }
+
+        let mime_type: mime::Mime = filename
+            .split('.')
+            .last()
+            .and_then(|ext| match ext {
+                "pdf" => Some("application/pdf".parse().ok()),
+                "png" => Some("image/png".parse().ok()),
+                "jpg" | "jpeg" => Some("image/jpeg".parse().ok()),
+                "txt" => Some("text/plain".parse().ok()),
+                "csv" => Some("text/csv".parse().ok()),
+                "xlsx" => Some(
+                    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+                        .parse()
+                        .ok(),
+                ),
+                "docx" => Some(
+                    "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+                        .parse()
+                        .ok(),
+                ),
+                _ => Some("application/octet-stream".parse().ok()),
+            })
+            .flatten()
+            .unwrap_or_else(|| "application/octet-stream".parse().unwrap());
+
+        let email = Message::builder()
+            .from(
+                smtp_from
+                    .parse()
+                    .map_err(|e| format!("Invalid from address: {}", e))?,
+            )
+            .to(to
+                .parse()
+                .map_err(|e| format!("Invalid to address: {}", e))?)
+            .subject(subject)
+            .multipart(
+                MultiPart::mixed()
+                    .singlepart(SinglePart::html(body.to_string()))
+                    .singlepart(
+                        Attachment::new(filename.to_string()).body(Body::new(file_data), mime_type),
+                    ),
+            )
+            .map_err(|e| format!("Failed to build email: {}", e))?;
+
+        let mailer = if !smtp_user.is_empty() && !smtp_pass.is_empty() {
+            let creds = Credentials::new(smtp_user, smtp_pass);
+            SmtpTransport::relay(&smtp_host)
+                .map_err(|e| format!("SMTP relay error: {}", e))?
+                .port(smtp_port)
+                .credentials(creds)
+                .build()
+        } else {
+            SmtpTransport::relay(&smtp_host)
+                .map_err(|e| format!("SMTP relay error: {}", e))?
+                .port(smtp_port)
+                .build()
+        };
+
+        mailer
+            .send(&email)
+            .map_err(|e| format!("Failed to send email: {}", e))?;
+
+        info!("Email with attachment sent to {} (bot {})", to, bot_id);
         Ok(())
     }
 }