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/core/diagnostics.py

@@ -3,23 +3,8 @@ from __future__ import annotations
 from vocero_api.core import config as settings
 from vocero_api.core import logging as app_logging
 
-
-# Resolve the execution URL for the startup banner using the same normalization
-# as _apipilot_resolve_execute_url.
-def _resolve_exec_url_for_startup_banner() -> str:
-    base = (settings.S2S_APIPILOT_TOOLS_EXECUTE_URL or settings.S2S_APIPILOT_TOOLS_URL).strip().rstrip("/")
-    if not base:
-        return ""
-    if base.lower().endswith("/execute"):
-        return base
-    return f"{base}/execute"
-
-
-_STARTUP_APIPILOT_EXEC_URL = _resolve_exec_url_for_startup_banner()
-del _resolve_exec_url_for_startup_banner
-
 app_logging.logger.info(
-    "[STARTUP] Other externals — reasoning=%s serper=%s lb=%s s2sProxy=%s s2sDirect=%s userAuth=%s reportsApi=%s injectReports=%s reportsHintMax=%d reportsInjectMode=%s injectToday=%s summaryApi=%s summaryText=%s loginApi=%s injectProfile=%s debugPrompt=%s startSessionMode=%s theme=%s apipilotToolsUrl=%s apipilotExecuteUrlOverride=%s apipilotServiceToken=%s apipilotTtl=%ds apipilotTimeout=%.1fs apipilotReasoningPass2=%s apipilotApiKeyBypass=%s",
+    "[STARTUP] Other externals — reasoning=%s serper=%s lb=%s s2sProxy=%s s2sDirect=%s userAuth=%s reportsApi=%s injectReports=%s reportsHintMax=%d reportsInjectMode=%s injectToday=%s summaryApi=%s summaryText=%s loginApi=%s injectProfile=%s debugPrompt=%s startSessionMode=%s theme=%s",
     settings.S2S_REASONING_TYPE,
     bool(settings.SERPER_KEY),
     bool(settings.LOAD_BALANCER_URL),
@@ -38,27 +23,7 @@ app_logging.logger.info(
     settings.S2S_DEBUG_PROMPT,
     settings.S2S_START_SESSION_MODE or "-",
     settings.S2S_THEME or "-",
-    settings.S2S_APIPILOT_TOOLS_URL or "-",
-    (settings.S2S_APIPILOT_TOOLS_EXECUTE_URL + f"(resolved:{_STARTUP_APIPILOT_EXEC_URL})")
-    if settings.S2S_APIPILOT_TOOLS_EXECUTE_URL
-    else "-",
-    "Y" if bool(settings.S2S_APIPILOT_SERVICE_TOKEN) else "-",
-    settings.APIPILOT_CACHE_TTL_SEC,
-    settings.APIPILOT_HTTP_TIMEOUT,
-    "Y" if (bool(settings.S2S_APIPILOT_TOOLS_URL) or bool(settings.S2S_APIPILOT_TOOLS_EXECUTE_URL)) else "-",
-    (
-        "YES head="
-        + (
-            settings.S2S_APIPILOT_API_KEY[:6] + "..."
-            if len(settings.S2S_APIPILOT_API_KEY) > 6
-            else settings.S2S_APIPILOT_API_KEY
-        )
-        + " (3 FORMS!)"
-    )
-    if settings.S2S_APIPILOT_API_KEY
-    else "-",
 )
-del _STARTUP_APIPILOT_EXEC_URL
 
 if settings.S2S_MCP_URL:
     app_logging.logger.info(