Add debug_container_response tool for DSM response inspection

Temporary debug tool that returns the raw SYNO.Docker.Container/get
response as JSON directly in the MCP tool output — visible in chat
without needing to inspect Claude Desktop logs.

To be removed once get_container_status is fixed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/mcp_synology_container/modules/containers.py

@@ -108,6 +108,29 @@ def register_containers(mcp: FastMCP, config: AppConfig, client: DsmClient) -> N
 
         return "\n".join(lines).rstrip()
 
+    @mcp.tool()
+    async def debug_container_response(container_name: str) -> str:
+        """TEMPORARY DEBUG TOOL — returns raw SYNO.Docker.Container/get response as JSON.
+
+        Used to inspect the actual DSM response structure so that
+        get_container_status can be fixed to read the correct fields.
+        Remove once the real fix is in place.
+
+        Args:
+            container_name: Name of the container to inspect.
+        """
+        clean_name = _strip_hash_prefix(container_name)
+        try:
+            data = await client.request(
+                "SYNO.Docker.Container",
+                "get",
+                params={"name": clean_name},
+            )
+        except Exception as e:
+            return f"Error calling SYNO.Docker.Container/get for '{clean_name}': {e}"
+
+        return json.dumps(data, indent=2, default=str)
+
     @mcp.tool()
     async def get_container_status(container_name: str) -> str:
         """Get detailed status, uptime, and resource usage of a container.