GHSA-p9x3-w98f-7j3q

### Summary The MCP token service did not validate token ownership, allowing a Creator within the same base to read, regenerate, or delete another user's MCP tokens if the token ID was known. ### Details `McpTokenService.get()`, `regenerateToken()`, and `delete()` did not filter by `fk_user_id`. The analogous `ApiTokensService` correctly enforced ownership. ### Impact Limited — requires Creator role and knowledge of target token ID. Primary risk is denial of service (invalidating tokens) and scoped token disclosure. ### Credit This issue was reported by [@bugbunny-research](https://github.com/bugbunny-research) (bugbunny.ai).