test(e2e): complete schema validation for all backend dispatch branches

Addresses Gemini review feedback on PR #1409. The dispatch smoke test
now asserts the full container_info schema on every branch:

- haos_inaddon: add ``port is None`` and ``config_path is None``
  assertions (matching the external branch's coverage).
- container: add ``config_path is not None`` and
  ``.get('addon_mcp_url') is None`` assertions.

The container-branch ``addon_mcp_url`` assertion uses ``.get()`` instead
of bracket access because the container fixture dict at
conftest.py:1698-1706 does NOT include an ``addon_mcp_url`` key — only
the HAOS branches do. Inline comment notes the asymmetry.

Author: kingpanther13

tests/src/e2e/basic/test_backend_dispatch_smoke.py

@@ -100,6 +100,8 @@ def test_backend_dispatch_matches_workflow_env(
             f"wrong endpoint."
         )
         assert ha_container_with_fresh_config["container"] is None
+        assert ha_container_with_fresh_config["port"] is None
+        assert ha_container_with_fresh_config["config_path"] is None
     elif image_path:
         assert backend == "haos", (
             f"Workflow set HAOS_TEST_IMAGE_PATH but dispatch picked "
@@ -118,6 +120,11 @@ def test_backend_dispatch_matches_workflow_env(
         )
         assert ha_container_with_fresh_config["container"] is not None
         assert ha_container_with_fresh_config["port"] is not None
+        assert ha_container_with_fresh_config["config_path"] is not None
+        # The container branch (conftest.py:1698-1706) does NOT include
+        # an addon_mcp_url key at all, unlike the HAOS branches. Use
+        # .get() so the assertion holds against either absence or None.
+        assert ha_container_with_fresh_config.get("addon_mcp_url") is None
 
 
 async def test_supervisor_addon_tool_behavior_matches_backend(