fix: case-insensitive container name matching for docker inspect

Docker container names are case-sensitive for 'docker inspect' but case-
insensitive for Docker DNS. Compose templates may render container names
with mixed case (e.g. code-server-Headquarter-abc123), causing exact-name
docker inspect to fail while DNS resolution in tunnels works fine.

- apps/api/src/services/docker.py: get_container_id now tries exact match
  first, then falls back to case-insensitive exact match via 'docker ps'
- apps/api/src/api/tool_instances.py: recreate_tunnel_endpoint uses
  get_container_id instead of its own docker inspect call

Quality gates: ruff clean

apps/api/src/api/tool_instances.py

@@ -2470,26 +2470,16 @@ async def recreate_tunnel_endpoint(
         tool_type.default_port,
     )
 
-    # Find the tool container — try stored ID first, then fall back to exact name
+    # Find the tool container — try stored ID first, then fall back to name lookup
     tool_container_id = instance.container_id
     if tool_container_id:
         logger.info("Using stored container_id: %s", tool_container_id)
     else:
-        # Use exact name match via inspect to avoid substring collisions with tunnel containers
-        inspect_result = subprocess.run(
-            ["docker", "inspect", "-f", "{{.Id}}", expected_name],
-            capture_output=True,
-            text=True,
-        )
-        if inspect_result.returncode == 0 and inspect_result.stdout.strip():
-            tool_container_id = inspect_result.stdout.strip()
-            logger.info("Found container by exact name: %s", tool_container_id)
+        tool_container_id = get_container_id(expected_name)
+        if tool_container_id:
+            logger.info("Found container by name: %s", tool_container_id)
         else:
-            logger.error(
-                "Container %s not found via docker inspect: %s",
-                expected_name,
-                inspect_result.stderr,
-            )
+            logger.error("Container %s not found", expected_name)
             raise HTTPException(
                 status_code=status.HTTP_400_BAD_REQUEST,
                 detail="Could not find running container for this instance",