refactor: flatten monorepo structure to backend/ frontend/ devops/

Rename subdirectories for a cleaner single-repo layout:
- website-monitoring-backend/  → backend/
- website-monitoring-frontend/ → frontend/
- website-monitoring-devops/   → devops/

Update all references in package.json scripts, CI workflows,
docker-compose, pre-commit hooks, and documentation.

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

dev-setup.sh

@@ -21,7 +21,7 @@ echo "  ✅ Node $(node --version), Docker, Supabase CLI found"
 # 2. Start Supabase (if not already running)
 echo ""
 echo -e "${YELLOW}[2/6] Starting local Supabase...${NC}"
-cd website-monitoring-frontend
+cd frontend
 if supabase status 2>&1 | grep -q "API URL"; then
   echo "  ✅ Supabase already running"
 else
@@ -50,32 +50,32 @@ SUPABASE_SERVICE_ROLE_KEY=${SERVICE_KEY}
 LIGHTHOUSE_SERVICE_URL=http://localhost:5000
 CRON_SECRET=local-dev-secret
 EOF
-echo "  ✅ Created website-monitoring-frontend/.env.local"
+echo "  ✅ Created frontend/.env.local"
 cd ..
 
 # 4. Create backend .env
 echo ""
 echo -e "${YELLOW}[4/6] Configuring backend environment...${NC}"
-cat > website-monitoring-backend/.env << EOF
+cat > backend/.env << EOF
 PORT=5000
 CORS_ORIGIN=http://localhost:3000
 NODE_ENV=development
 EOF
-echo "  ✅ Created website-monitoring-backend/.env"
+echo "  ✅ Created backend/.env"
 
 # 5. Install dependencies
 echo ""
 echo -e "${YELLOW}[5/6] Installing dependencies...${NC}"
 npm install --silent 2>/dev/null
-cd website-monitoring-backend && npm install --silent 2>/dev/null && cd ..
-cd website-monitoring-frontend && npm install --silent 2>/dev/null && cd ..
+cd backend && npm install --silent 2>/dev/null && cd ..
+cd frontend && npm install --silent 2>/dev/null && cd ..
 echo "  ✅ Dependencies installed"
 
 # 6. Run database migrations
 echo ""
 echo -e "${YELLOW}[6/6] Applying database migrations...${NC}"
-cd website-monitoring-frontend
-supabase db reset --no-seed 2>/dev/null || echo "  ⚠️  Migrations may need manual review (run: cd website-monitoring-frontend && supabase db reset)"
+cd frontend
+supabase db reset --no-seed 2>/dev/null || echo "  ⚠️  Migrations may need manual review (run: cd frontend && supabase db reset)"
 cd ..
 
 echo ""
@@ -92,7 +92,7 @@ echo -e "${YELLOW}📋 Quick commands:${NC}"
 echo "  npm test              — run all tests"
 echo "  npm run build         — build everything"
 echo "  npm run lint          — lint everything"
-echo "  supabase stop         — stop local DB (in website-monitoring-frontend/)"
+echo "  supabase stop         — stop local DB (in frontend/)"
 echo ""
 echo -e "${YELLOW}🔑 Test cron endpoints locally:${NC}"
 echo "  curl -H 'Authorization: Bearer local-dev-secret' http://localhost:3000/api/cron/uptime"