FIX(app): restore su - ubuntu -c for proper env and PATH

- su ubuntu -c may not set env vars properly
- Change to su - ubuntu -c to use login shell environment
- Projects path is hardcoded to /home/ubuntu/Projects

deploy/k8s/overlays/prod/kustomization.yaml

@@ -16,5 +16,5 @@ commonLabels:
 # 이미지 태그 설정 (ArgoCD Image Updater가 자동으로 업데이트)
 images:
   - name: gitea0213.kro.kr/bluemayne/mas
-    newTag: main-sha-878bf6866a72be3fd2f7064c8bcda96097093f40
+    newTag: main-sha-b8e84c1b6bc380490e4b313459ee02f438e3c125
 

services/backend/tools/bash_tool.py

@@ -91,16 +91,15 @@ def execute_host(command: str, timeout: int = 30, use_sudo: bool = False) -> str
         # -n: network namespace
         # -i: IPC namespace
         # Run as ubuntu user to avoid git "dubious ownership" errors
-        # Use 'su ubuntu -c' (without -) to preserve current directory context
-        # This allows commands to work from SSH initial directory
+        # Use 'su - ubuntu -c' to get proper environment variables and PATH
+        # Projects folder is at /home/ubuntu/Projects (hardcoded in prompts)
         if use_sudo:
             # For sudo commands, run directly with sudo
             nsenter_command = f"nsenter -t 1 -m -u -n -i -- sh -c {subprocess.list2cmdline([f'sudo {command}'])}"
         else:
-            # For regular commands, run as ubuntu user
-            # Use 'su ubuntu -c' (not 'su - ubuntu -c') to preserve current directory
-            # This matches SSH behavior where you start from the initial directory
-            nsenter_command = f"nsenter -t 1 -m -u -n -i -- su ubuntu -c {subprocess.list2cmdline([command])}"
+            # For regular commands, run as ubuntu user with login shell
+            # This ensures proper environment variables (PATH, HOME, etc.)
+            nsenter_command = f"nsenter -t 1 -m -u -n -i -- su - ubuntu -c {subprocess.list2cmdline([command])}"
 
         result = subprocess.run(
             nsenter_command,