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/20250813102540_fix_user_select_rls.sql

@@ -0,0 +1,21 @@
+-- Fix RLS policies for users table to allow proper user details loading
+-- Add policies for SELECT operations on users table
+
+-- Allow users to select their own profile
+CREATE POLICY "Users can select their own profile" ON public.users
+FOR SELECT USING (auth.uid() = id);
+
+-- Allow users to select profiles in their organization
+CREATE POLICY "Users can select profiles in their organization" ON public.users
+FOR SELECT USING (
+  organization_id IN (
+    SELECT organization_id FROM public.users WHERE id = auth.uid()
+  )
+);
+
+-- Allow service role to select any user (for admin operations)
+CREATE POLICY "Service role can select any user" ON public.users
+FOR SELECT USING (auth.role() = 'service_role');
+
+-- Refresh schema cache
+NOTIFY pgrst, 'reload schema';