feat: add Search Console OAuth credentials

[siisee11]

Summary

• add OAuth-capable Google Search Console credentials while preserving raw access-token credentials
• mark Search Console as a Google OAuth dashboard connection form
• cover Search Console OAuth credentials in credential schema/type guard tests

Test plan

• bunx vitest run packages/db/src/credentials.test.ts
• bunx oxlint packages/db/src/credentials.ts packages/db/src/credentials.test.ts packages/db/src/source-providers.ts --format json

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	onequery-landing	d6812db	Commit Preview URL Branch Preview URL	Jun 24 2026, 01:43 PM