pomerium / pomerium / 22975777861
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mcp: add MCP server indicators and connect/disconnect to routes portal (#6184)

## Summary

Users currently have no visibility into which MCP upstream servers
they're authenticated with, and no way to connect or disconnect from the
routes portal. This means they must rely on external tooling or direct
API calls to manage MCP connections.

This PR adds MCP server awareness to the routes portal so users can see
connection status at a glance and manage connections directly from the
UI, bringing MCP routes to parity with the existing portal experience.

- MCP server routes appear in their own "MCP Servers" section (between
HTTP and TCP)
- Each card shows connection status and provides connect/disconnect
actions
- Connect errors from the OAuth flow are surfaced via a dismissible
alert
- Backend queries per-user MCP connection status via the databroker,
gated behind the `mcp` runtime flag

## Related issues

- [ENG-3674](https://linear.app/pomerium/issue/ENG-3674)

## User Explanation

MCP server routes now appear in the routes portal with connection status
indicators. Users can connect to upstream MCP servers directly from the
portal and disconnect when no longer needed. If a connection attempt
fails (e.g. due to an OAuth error), the portal displays the error
message.

## Checklist

- [x] reference any related issues
- [x] updated unit tests
- [ ] add appropriate label (`enhancement`, `bug`, `breaking`,
`dependencies`, `ci`)
- [ ] ready for review

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Jobs
ID Job ID Ran Files Coverage
1 22975777861.1 688
45.43
 GitHub Action Run
Source Files on build 22975777861