B: Update docs and add tests

[davidpomerenke]

Summary\n\n- README.md completely rewritten to describe the actual app (survey workflow, Python pipeline, all API routes, admin whitelist, full migration order, file structure) — the previous README described the original boilerplate template.\n- docs/TODO.md restructured with clearer bug descriptions and a "Recently Fixed" section.\n- vitest.config.ts added — minimal vitest setup with @/ path alias.\n- src/tests/auth.test.ts — unit tests for verifySession, generateToken, and isAllowedDomain (no DB required; covers tampered signature, expired token, uniqueness).\n- src/tests/get-base-url.test.ts — unit tests for getBaseUrl() under various env and header configurations using mocked next/headers.\n- python/tests/test_metadata_cleaning.py — basic pytest tests for clean_symbol, normalize_text, extract_year_from_symbol; pure-function tests with no DB dependency.\n\n## Test plan\n\n- [ ] npx vitest run — TypeScript tests pass\n- [ ] uv run pytest python/tests/ — Python tests pass\n- [ ] pnpm typecheck — no new TypeScript errors\n- [ ] README renders correctly on GitHub\n\n🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
un80-sg-reports-survey	Error		Jun 17, 2026 6:17am