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/troubleshooting.md

@@ -12,7 +12,7 @@ Inspect the server configuration without printing secret environment files:
 curl -fsS http://localhost:8420/api/config | jq
 ```
 
-Confirm `s2sUrl`, `lb`, `reasoningType`, `injectProfile`, `apipilot`, `theme`
+Confirm `s2sUrl`, `lb`, `reasoningType`, `injectProfile`, `mcp`, `theme`
 and `startSessionMode`. A direct WebSocket URL bypasses the local relay's
 server-side context injection and marker execution. For a local proxy, confirm
 the server can resolve and reach `S2S_PROXY_TARGET`.
@@ -50,8 +50,10 @@ Follow the actual execution mechanism:
    JSON-string arguments.
 3. Confirm the browser dispatched `toolcall` and the executor sent its request.
 4. Confirm `function_call_output` and any required `response.create` were sent.
-5. For ApiPilot, inspect discovery, marker detection, authorization/schema
-   validation, execution, and second-pass result injection instead.
+5. For MCP, inspect conversation creation, `/api/mcp/tools` discovery,
+   `mcp_tool_completed` logs, and the returned tool data/follow-up response.
+   Verify the conversation belongs to the browser and backend authorization
+   succeeds; do not retry with shared credentials or legacy content endpoints.
 
 A spoken sentence such as “Voy a buscar el reporte” does not satisfy step 2.
 If the function-call event is absent, inspect model/backend tool generation
@@ -59,7 +61,7 @@ before debugging a browser executor that has not been invoked.
 
 Earlier local debug notes recorded a reproduction where tools and required
 tool policy were sent but the model produced only spoken text. Those notes
-refer to the retired MCP ranking path; they do not establish a current ApiPilot
+refer to the retired MCP ranking path; they do not establish a current AquaPortal MCP
 failure. Both local investigation notes remain marked `OPEN`. Their useful
 lesson is to collect evidence at each boundary and reproduce against current
 code before claiming a root cause is resolved.
@@ -114,7 +116,7 @@ Useful checks are:
 
 The historical investigation introduced a 90ms playback prebuffer and reduced
 MCP prompt reinjection. The old 150ms MCP fallback timer is historical, not a
-current ApiPilot configuration knob. Verify the live worklet and current relay
+current MCP configuration knob. Verify the live worklet and current relay
 before changing audio timing based on those observations.
 
 ## External reasoning and startup