chore(vocero): remove the legacy ApiPilot integration (#3)

Vocero now retrieves AquaPortal content through authenticated MCP. This removes the obsolete ApiPilot integration from the API and browser while preserving the separately deployed speech pipeline.

Release notes:

- Removed ApiPilot endpoints, configuration, credential overrides, and HTTP/realtime tool execution.
- Removed browser ApiPilot catalog loading and prompt generation while retaining authenticated MCP discovery.
- Updated regression coverage and operating documentation for the retired routes and settings.

Reviewed-on: AquaPortal/s2s#3

vocero-api/tests/test_mcp_orchestration.py

@@ -143,8 +143,8 @@ def test_http_chains_tools_retains_history_and_ignores_browser_identity(enabled,
         assert client.post("/api/reasoning", json=body).status_code == 401
         assert client.get("/api/user/phone?phoneNumber=123").status_code == 409
         assert client.get("/api/user/reports").status_code == 409
-        assert client.get("/api/apipilot/tools").status_code == 409
-        assert client.post("/api/apipilot/execute", json={"name": "get_report"}).status_code == 409
+        assert client.get("/api/apipilot/tools").status_code == 404
+        assert client.post("/api/apipilot/execute", json={"name": "get_report"}).status_code == 404
         enabled.assert_awaited_once_with("+56000000001")