feat(api): chatbot-facing MCP server for task orchestration (Phase 3)

Adds a chatbot-facing MCP server mounted at /chatbot/mcp, guarded by the shared
API bearer token (new config api_token, wired through SetAPIToken). Tools:
submit_task, list_tasks, get_task, get_events, answer_question, accept_task,
reject_task, cancel_task. submit_task creates and immediately queues a task,
resolving the repository URL from a named project when not given explicitly.

To keep the REST API and the MCP surface from drifting, the accept/reject/
cancel/answer operations are extracted into a shared service layer (taskops.go)
with typed errors mapped to REST status codes; the existing HTTP handlers now
delegate to it. The endpoint is only served when a token is configured and
presented as a bearer.

https://claude.ai/code/session_01SESwn7kQ7oP62trWw6pc39

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