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/api/routes/config.py

@@ -21,12 +21,7 @@ async def config(request: Request) -> JSONResponse:
     """Client bootstrap: whether web search is available, whether the deploy runs
     behind a load balancer (so the browser uses the /api/session proxy),
     and whether the user may instead set a direct
-    s2s server URL. The LB address itself is intentionally NOT included.
-
-    2026-09-24: new top-level `apipilot` flag. When True the deploy exposes the
-    new `/api/apipilot/tools` and `/api/apipilot/execute` proxy endpoints (see
-    docs/client/tool-calling.md) that the browser may call directly instead of
-    hardcoding upstream tool URLs / names."""
+    s2s server URL. The LB address itself is intentionally NOT included."""
     app_logging.logger.debug(
         "[INTERNAL] /api/config requested client=%s", request.client.host if request.client else "?"
     )
@@ -42,7 +37,6 @@ async def config(request: Request) -> JSONResponse:
         "debugPrompt": settings.S2S_DEBUG_PROMPT,
         "startSessionMode": settings.S2S_START_SESSION_MODE,
         "theme": settings.S2S_THEME,
-        "apipilot": bool(settings.S2S_APIPILOT_TOOLS_URL),
     }
     if settings.S2S_MCP_URL:
         if settings.S2S_REASONING_TYPE == "PROXY" and (
@@ -50,13 +44,12 @@ async def config(request: Request) -> JSONResponse:
         ):
             raise HTTPException(503, "MCP en modo PROXY requiere la conexión de voz a través de Vocero.")
         out["mcp"] = True
-        out["apipilot"] = False
     app_logging.logger.debug(
-        "[INTERNAL] /api/config returned promptLen=%d reasoning=%s startSessionMode=%s theme=%s apipilot=%s",
+        "[INTERNAL] /api/config returned promptLen=%d reasoning=%s startSessionMode=%s theme=%s mcp=%s",
         len(primary_prompt),
         settings.S2S_REASONING_TYPE,
         settings.S2S_START_SESSION_MODE or "-",
         settings.S2S_THEME or "-",
-        out["apipilot"],
+        bool(settings.S2S_MCP_URL),
     )
     return validated_json_response(out, ConfigResponse)