refactor: migrate patch test schema from service-level to dedicated tables

- Remove patch_test_duration_hours from services table
- Add new patch_tests table with service_ids array, notice_duration_hours, expiry_months
- Add new user_patch_tests table linking users to patch_tests with tested_at
- Update services handler to check patch_tests.service_ids for eligibility
- Update booking creation to validate patch test requirements (24h notice, 6mo expiry)
- Update booking completion to extend patch test validity (reset tested_at)
- Update admin handlers for new patch test CRUD operations
- Update test fixtures and test cases for new schema
- Update seeding script to create patch_tests and link to gel services

backend/handlers/bookings/manage.go

@@ -429,6 +429,67 @@ func AdminCreateBookingForUserHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// Check patch test requirements for all services
+	for _, serviceID := range req.ServiceIDs {
+		// Find patch test for this service
+		var patchTestID string
+		var noticeHours int
+		err := db.DB.QueryRow(r.Context(), `
+			SELECT id, notice_duration_hours
+			FROM patch_tests
+			WHERE $1 = ANY(service_ids)
+		`, serviceID).Scan(&patchTestID, &noticeHours)
+
+		if err == nil {
+			// Service requires a patch test - check if user has valid record
+			var testedAt time.Time
+			err = db.DB.QueryRow(r.Context(), `
+				SELECT tested_at
+				FROM user_patch_tests
+				WHERE user_id = $1 AND patch_test_id = $2
+			`, req.UserID, patchTestID).Scan(&testedAt)
+
+			if err != nil {
+				// No valid patch test record
+				http.Error(w, "Patch test required for this service. Please complete a patch test first.", http.StatusBadRequest)
+				return
+			}
+
+			// Check if notice period has passed
+			eligibleFrom := testedAt.Add(time.Duration(noticeHours) * time.Hour)
+			if req.StartTime.Before(eligibleFrom) {
+				hoursNeeded := time.Until(eligibleFrom).Hours()
+				http.Error(w, fmt.Sprintf("Booking time is before the %.0f hour notice period after patch test. Earliest booking: %s", hoursNeeded, eligibleFrom.Format("2006-01-02 15:04")), http.StatusBadRequest)
+				return
+			}
+
+			// Check if patch test has expired
+			var expiryMonths int
+			err = db.DB.QueryRow(r.Context(), `SELECT expiry_months FROM patch_tests WHERE id = $1`, patchTestID).Scan(&expiryMonths)
+			if err == nil {
+				expiresAt := testedAt.AddDate(0, expiryMonths, 0)
+				if req.StartTime.After(expiresAt) {
+					http.Error(w, "Your patch test has expired. Please complete a new patch test.", http.StatusBadRequest)
+					return
+				}
+			}
+		}
+	}
+
+	// Validate overrides
+	if req.UserID == "" {
+		http.Error(w, "User ID is required", http.StatusBadRequest)
+		return
+	}
+	if req.StartTime.IsZero() {
+		http.Error(w, "Start time is required", http.StatusBadRequest)
+		return
+	}
+	if len(req.ServiceIDs) == 0 {
+		http.Error(w, "At least one service is required", http.StatusBadRequest)
+		return
+	}
+
 	// Validate overrides
 	for _, override := range req.ServiceOverrides {
 		if override.ServiceID == "" {