Add Supabase authentication and Railway production deployment

[CodeWithMoin]

Summary

• add Supabase Google OAuth and email magic-link authentication
• deploy the React and FastAPI application together on Railway
• configure Supabase Postgres and private S3-compatible document storage
• support direct navigation to React routes such as /login and /app/qa
• simplify authentication loading states
• document the production deployment workflow

Validation

• frontend production build and ESLint
• Ruff
• 11 focused authentication, configuration, and SPA routing tests
• Alembic migrations against Supabase Postgres
• Railway health checks

Tradeoff

Supabase performs external identity verification during sign-in, after which DocuLens uses its existing secure HTTP-only application session. This keeps normal API requests independent of an external auth call.

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📥 Commits

Reviewing files that changed from the base of the PR and between 218caef and 6d48155.

⛔ Files ignored due to path filters (1)

• frontend/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (72)

• .env.example
• .github/workflows/backend-ci.yml
• Makefile
• README.md
• app/agents/__init__.py
• app/agents/graph.py
• app/agents/model_client.py
• app/agents/models.py
• app/agents/tools.py
• app/alembic/env.py
• app/alembic/versions/20260730_0005_add_federated_identity.py
• app/alembic/versions/20260730_0006_create_investigations.py
• app/api/auth_router.py
• app/api/endpoint.py
• app/api/investigation_router.py
• app/api/router.py
• app/config/celery_config.py
• app/config/database_config.py
• app/config/settings.py
• app/core/observability.py
• app/database/database_utils.py
• app/database/investigation.py
• app/database/models.py
• app/database/user.py
• app/doc_utils/chunking.py
• app/doc_utils/embedding.py
• app/doc_utils/extraction.py
• app/doc_utils/search.py
• app/doc_utils/utils/tokenizer.py
• app/evaluation/investigation.py
• app/frontend.py
• app/main.py
• app/pipelines/doculens_pipeline.py
• app/services/auth_service.py
• app/services/document_storage.py
• app/services/investigation_service.py
• app/services/vector_store.py
• app/start.sh
• app/tasks/tasks.py
• app/utils/insert_vectors.py
• docker/Dockerfile.celery
• docker/Dockerfile.railway
• docker/docker-compose.yml
• docs/deploy-railway.md
• frontend/package.json
• frontend/src/api/client.ts
• frontend/src/api/types.ts
• frontend/src/auth/AuthProvider.tsx
• frontend/src/auth/ProtectedRoute.tsx
• frontend/src/auth/supabase.ts
• frontend/src/auth/types.ts
• frontend/src/components/layout/AppShell.tsx
• frontend/src/main.tsx
• frontend/src/pages/IntakePage.tsx
• frontend/src/pages/InvestigationPage.tsx
• frontend/src/pages/LandingPage.tsx
• frontend/src/pages/LoginPage.tsx
• frontend/src/styles/globals.css
• frontend/vite.config.ts
• pyproject.toml
• pyrightconfig.json
• railway.toml
• railway.worker.toml
• tests/conftest.py
• tests/test_api_endpoints.py
• tests/test_auth_service.py
• tests/test_database_models.py
• tests/test_investigation_agent.py
• tests/test_investigation_evaluation.py
• tests/test_lightweight_extraction.py
• tests/test_settings.py
• tests/test_spa_static_files.py

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