chore: Add deployment checklist and PM2 configuration examples

This commit introduces a new `DEPLOYMENT_CHECKLIST.md` file that outlines the necessary steps for configuring server-specific settings after pulling from Git. It includes instructions for environment files, PM2 configuration, firewall rules, database setup, and building frontends. Additionally, it adds an example `ecosystem.config.js.example` file for PM2 configuration, providing a template for users to customize for their deployment environment. The `.gitignore` file is updated to include the new PM2 ecosystem config file.

backend/api/auth.py

@@ -344,9 +344,18 @@ def get_current_user_info(
         is_admin = user.is_admin if user else False
     
     role_value = _resolve_user_role(user, is_admin)
-    permissions_map = fetch_role_permissions_map(db)
-    permissions = permissions_map.get(role_value, {})
-    
+   
+      # Fetch permissions - if it fails, return empty permissions to avoid blocking login
+    try:
+        permissions_map = fetch_role_permissions_map(db)
+        permissions = permissions_map.get(role_value, {})
+    except Exception as e:
+        # If permissions fetch fails, return empty permissions to avoid blocking login
+        # Log the error but don't fail the request
+        import traceback
+        print(f"⚠️  Failed to fetch permissions for /me endpoint: {e}")
+        print(f"   Traceback: {traceback.format_exc()}")
+        permissions = {}
     return UserResponse(
         username=username,
         is_admin=is_admin,