fix: Use internal target dir, hostname system from /etc/hosts, remove env vars

- Remove CARGO_TARGET_DIR env var (use default target/ inside project)
- Remove STAGE_SYSTEM_HOST and SYSTEM_USER (use gbuser@system from /etc/hosts)
- Fix deploy paths to /opt/gbo/work/generalbots/target/debug/
- Frees 12G on alm-ci by removing /opt/gbo/work/target/

.forgejo/workflows/botserver.yaml

@@ -15,12 +15,9 @@ jobs:
   build:
     runs-on: gbo
     env:
-      CARGO_TARGET_DIR: /opt/gbo/work/target
       RUSTC_WRAPPER: sccache
       CARGO_INCREMENTAL: "0"
       PATH: /home/gbuser/.cargo/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/sbin:/bin
-      STAGE_SYSTEM_HOST: 10.0.3.10
-      SYSTEM_USER: gbuser
     steps:
       - name: Setup
         run: |
@@ -43,15 +40,15 @@ jobs:
 
       - name: Deploy to Stage
         run: |
-          echo "=== Deploying BotServer and BotUI to Stage ==="
+          echo "=== Deploying to Stage ==="
           scp -i /home/gbuser/.ssh/id_ed25519 -o StrictHostKeyChecking=no \
-            /opt/gbo/work/target/debug/botserver \
-            ${SYSTEM_USER}@${STAGE_SYSTEM_HOST}:/opt/gbo/bin/botserver-new
+            /opt/gbo/work/generalbots/target/debug/botserver \
+            gbuser@system:/opt/gbo/bin/botserver-new
           scp -i /home/gbuser/.ssh/id_ed25519 -o StrictHostKeyChecking=no \
-            /opt/gbo/work/target/debug/botui \
-            ${SYSTEM_USER}@${STAGE_SYSTEM_HOST}:/opt/gbo/bin/botui-new
+            /opt/gbo/work/generalbots/target/debug/botui \
+            gbuser@system:/opt/gbo/bin/botui-new
           ssh -i /home/gbuser/.ssh/id_ed25519 -o StrictHostKeyChecking=no \
-            ${SYSTEM_USER}@${STAGE_SYSTEM_HOST} \
+            gbuser@system \
             "sudo systemctl stop botserver || true && \
              sudo systemctl stop ui || true && \
              sudo mv /opt/gbo/bin/botserver-new /opt/gbo/bin/botserver && \
@@ -61,6 +58,6 @@ jobs:
              sudo systemctl start ui"
           sleep 10
           ssh -i /home/gbuser/.ssh/id_ed25519 -o StrictHostKeyChecking=no \
-            ${SYSTEM_USER}@${STAGE_SYSTEM_HOST} \
+            gbuser@system \
             "curl -sf http://localhost:8080/health && echo 'BotServer OK' || echo 'BotServer FAILED'; \
              curl -sf http://localhost:3000/ && echo 'BotUI OK' || echo 'BotUI FAILED'"