Rewrites the apikeys settings tab for the new MCP architecture:
- Tab label: 'API Keys' → 'MCP Access'
- Shows the in-app MCP URL (<origin>/mcp) with a copy button
- Claude Code snippet uses --transport http + --url + --header
- Claude Desktop snippet uses {url, headers: {Authorization}}
- Drops the wheel-download flow, the 'Other' client tab, and the
stdio env file / Claude config download helpers — those were
for the standalone fable-mcp package which goes away in phase 8
The api_keys backend stays unchanged — keys double as bearer tokens
for the /mcp endpoint via the existing auth.py middleware.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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