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/vocero_api/services/mcp_tools.py

@@ -25,7 +25,7 @@ _CALL = re.compile(r"<<<VOCERO_MCP_CALL:NAME=([A-Za-z0-9_]+),ARGUMENTS=(.*)>>>",
 
 
 def selection(text: str) -> tuple[str, dict[str, Any]] | None:
-    """Use a marker that survives the speech pipeline's ApiPilot sanitizer."""
+    """Parse the internal tool selection marker returned by the speech model."""
     if "VOCERO_MCP" not in text.upper() and not text.lstrip().startswith("<<<"):
         return None
     match = _CALL.fullmatch(text.strip())