fix(catalog): favor Notion OAuth connection option

[neubig]

Problem

In integrations-hub, Slack and Linear surface as OAuth connectors, but Notion does not — it shows as an api_key connector.

Root cause

integrations/catalog/notion.json listed two connection options with the api (api_key / stdio MCP) option first and the oauth (OAuth2 / HTTP) option second:

"connectionOptions": [
  { "id": "api",   "auth": { "strategy": "api_key" } },  // first → used
  { "id": "oauth", "auth": { "strategy": "oauth2" } }    // second → ignored
]

integrations-hub builds each visible connector from only the first connection option (integration.connectionOptions[0] in src/lib/integrations/integration-catalog.ts), so Notion surfaced as an api_key connector and its OAuth option was silently dropped. Slack and Linear both list oauth first, which is why they show as OAuth connectors.

Fix

Reorder notion.json so the oauth option comes first (favored) and the api_key stdio MCP option remains as a fallback — matching the Slack/Linear convention. Both options are retained; only the order changes.

Verification

• JSON validated; option order is now ["oauth", "api"], first auth strategy oauth2.
• Ran the catalog test suite: 95 passed (test_catalogs.py, test_catalog_schema.py, test_integration_catalog_in_sync.py).
• No test asserts the previous ordering.

This is a catalog-data-only change (no code, no schema change). Once merged, release-please will fold it into the queued 0.8.0 release PR (#377).

This PR was created by an AI agent (OpenHands) on behalf of @neubig.

[openhands-release-bot]

🚀 Released in v0.8.0.