feat(auth): secure Google OAuth with code exchange, rate limits, and …

[aniebietafia]

…conflict checks

• Implement a secure Redis-backed single-use code exchange flow for Google OAuth to prevent access token leakage in browser history/redirects.
• Add a new POST /auth/google/exchange endpoint to exchange temporary codes for JWT access tokens and set HttpOnly refresh token cookies.
• Apply rate limiting of 10 requests/minute via slowapi to the Google login and callback endpoints.
• Add a verification check requiring email_verified to be True in the Google user profile.
• Look up users by google_id first during resolution to handle email updates and prevent database unique constraint conflicts.
• Update Google OAuth unit tests to cover the new flow.

[coderabbitai]

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ℹ️ Review info

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Run ID: f4f15379-cc95-4b20-a875-f84714d43e1b

📥 Commits

Reviewing files that changed from the base of the PR and between 2f225a6 and 1125982.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (6)

• .env.example
• app/modules/auth/api_docs.md
• app/modules/auth/router.py
• app/modules/auth/schemas.py
• app/modules/auth/service.py
• tests/test_auth/test_oauth_google.py

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• Create PR with unit tests
• Commit unit tests in branch feat/google-oauth

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