feat: initialize monorepo with full dev team best practices

- Unified monorepo with backend (Express), frontend (Next.js), and devops
- Backend: ESLint, Prettier, Jest tests (3 passing), health endpoint, .env.example
- Frontend: Fixed build errors, fixed all lint errors (0 remaining), tests passing
- DevOps: Docker Compose with PostgreSQL, backend, frontend + healthchecks
- CI/CD: 3 GitHub Actions workflows (backend, frontend, docker integration)
- DX: Husky pre-commit hooks with smart change detection
- Docs: Root README with architecture, CONTRIBUTING.md, PR template

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

website-monitoring-frontend/supabase/migrations/20250813102539_fix_crawl_sessions.sql

@@ -0,0 +1,11 @@
+-- Fix crawl_sessions table by adding missing columns
+-- Add missing columns to crawl_sessions table
+ALTER TABLE crawl_sessions ADD COLUMN IF NOT EXISTS processed_urls TEXT[] DEFAULT ARRAY[]::TEXT[];
+ALTER TABLE crawl_sessions ADD COLUMN IF NOT EXISTS pages_discovered INTEGER DEFAULT 0;
+ALTER TABLE crawl_sessions ADD COLUMN IF NOT EXISTS pages_processed INTEGER DEFAULT 0;
+ALTER TABLE crawl_sessions ADD COLUMN IF NOT EXISTS current_url VARCHAR;
+ALTER TABLE crawl_sessions ADD COLUMN IF NOT EXISTS error_message TEXT;
+ALTER TABLE crawl_sessions ADD COLUMN IF NOT EXISTS metadata JSONB DEFAULT '{}'::jsonb;
+
+-- Refresh schema cache to pick up new columns
+NOTIFY pgrst, 'reload schema';