fix: Valkey health check uses nc first (avoids password hang)

- nc -z checks port connectivity instantly (no auth needed)
- valkey-cli ping as fallback (hangs when password required)
- Fixes bootstrap hang on production where Valkey has Vault password

src/core/bootstrap/bootstrap_utils.rs

@@ -119,6 +119,18 @@ pub fn vault_health_check() -> bool {
 
 /// Check if Valkey/Redis cache is healthy
 pub fn cache_health_check() -> bool {
+    match SafeCommand::new("nc")
+        .and_then(|c| c.args(&["-z", "-w", "1", "127.0.0.1", "6379"]))
+        .and_then(|c| c.execute())
+    {
+        Ok(output) => {
+            if output.status.success() {
+                return true;
+            }
+        }
+        Err(_) => {}
+    }
+
     let stack_path =
         std::env::var("BOTSERVER_STACK_PATH").unwrap_or_else(|_| "./botserver-stack".to_string());
     let valkey_cli = format!("{}/bin/cache/bin/valkey-cli", stack_path);
@@ -135,25 +147,7 @@ pub fn cache_health_check() -> bool {
         }
     }
 
-    if let Ok(output) = SafeCommand::new("redis-cli")
-        .and_then(|c| c.args(&["-h", "127.0.0.1", "-p", "6379", "ping"]))
-        .and_then(|c| c.execute())
-    {
-        if output.status.success() {
-            let response = String::from_utf8_lossy(&output.stdout);
-            if response.trim().to_uppercase() == "PONG" {
-                return true;
-            }
-        }
-    }
-
-    match SafeCommand::new("nc")
-        .and_then(|c| c.args(&["-z", "-w", "1", "127.0.0.1", "6379"]))
-        .and_then(|c| c.execute())
-    {
-        Ok(output) => output.status.success(),
-        Err(_) => false,
-    }
+    false
 }
 
 /// Check if Qdrant vector database is healthy