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

docs/client/glossary.md

@@ -22,8 +22,8 @@ names shown in a deployment are configuration examples, not definitions.
 | Tool executor | Code that receives a tool call, executes it and returns the result to the model |
 | Web search | The browser-supported native tool whose request goes through the server's `/api/search` proxy |
 | Search proxy | Same-origin server route holding a deployment search key and calling the external provider |
-| ApiPilot | The dynamic-tool discovery/execution bridge, with both HTTP endpoints and model-text call markers |
-| Call marker | Internal structured text such as `<<<APIPILOT_CALL:...>>>` used by the ApiPilot bridge; separate from native function-call events |
+| AquaPortal MCP | Authenticated tool discovery and execution using the current conversation's backend session |
+| Call marker | Internal structured text such as `<<<VOCERO_MCP_CALL:...>>>` used by the MCP orchestrator; separate from native function-call events |
 | Tools panel | Controls for available browser tools and search-key configuration |
 | Settings | Connection, voice, audio and instruction controls persisted in browser storage |
 | Identity block | The header's product/user identity, separate from configuration dialogs |