Feat: add mcp server

[lukasdotcom]

Exposes an MCP server with all tools that are a function on the route /index.php/apps/app_api/proxy/context_agent/mcp/ when exposed through app api proxy

Notes/WIP

• This doesn't have auth implemented correctly right now it just trust the user to put the username into the Bearer header. Will change to use app password.
• Also hope that there is a better way to get the correct nc object for the tools than what is currently in the calendar and files tools otherwise that would need to be copied to all the other tools.
• Add guide on how to use this (docs) feat: mcp server docs documentation#13491
• Need to wait for the next release of fastmcp as this uses features that haven't been released yet (Middleware and context).

Have been using https://github.com/modelcontextprotocol/inspector to test it.

[Copilot]

Pull Request Overview

This PR adds Model Context Protocol (MCP) server functionality to the Nextcloud Context Agent, exposing available tools through a standardized MCP interface for external AI systems to consume.

Key changes:

• Integrates FastMCP library to create an MCP server with user authentication and dynamic tool loading
• Adds MCP server routing configuration to expose the server at /mcp endpoint
• Implements middleware for user authentication and dynamic tool registration

Reviewed Changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pyproject.toml	Adds fastmcp dependency for MCP server functionality
ex_app/lib/mcp_server.py	Core MCP server implementation with authentication and tool management
ex_app/lib/main.py	Integrates MCP server into main FastAPI application with proper lifecycle management
appinfo/info.xml	Configures routing for MCP endpoints through app API proxy
ex_app/lib/tools.py	Removes unused import that is no longer needed
ex_app/lib/all_tools/calendar.py	Minor formatting change (empty line addition)
ex_app/lib/all_tools/audio2text.py	Minor formatting change (empty line addition)

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