Rely on Notion integration permissions

[mrubens]

Summary

• remove Roomote's duplicate Notion read/write access mode and Manage Tools surface
• expose the native Notion tools and let Notion's configured capabilities authorize each operation
• keep content access limited to the pages and databases selected in Notion, including inherited child-page access
• clear legacy Notion per-tool overrides when the connection is saved
• retain the unused database column for the N-1 rollback window
• update setup guidance, public docs, tests, and release notes

Validation

• pnpm lint
• pnpm check-types
• pnpm knip
• pnpm --filter @roomote/docs check
• focused API, web, types, worker, cloud-agent, and Slack tests (190 tests)

[roomote-community]

No code issues found. See task

_{Reviewed 4bcdbc5}