feat: data surfacing — intake labels, service metrics, honest capacity

- booking views gain intakeLabels (declared key→label join); dashboard
  modal + manage view render real question labels with slug fallback
- GET /v1/metrics/services aggregates bookings/completed/cancelled/
  revenue per service + classBookings; service-report.csv delegates to
  the same ServiceMetrics aggregation and gains a completed column
- services page gains a Service performance card (per-service stat grid,
  locale CZK revenue, class-bookings footer); demo rows match the
  fabricated service list
- staff capacity utilization subtracts blocked days — tenant-wide and
  staff-scoped blocks remove that day's rule minutes via blockedAt
- tests: blocked-day capacity (tenant + staff scope), service aggregation

Authored By: TDvorak <[email protected]>

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/backend/internal/domain/models.go

@@ -27,6 +27,8 @@ type UpcomingBooking struct {
 	StaffName        string    `json:"staffName,omitempty"`
 	Notes            string    `json:"notes,omitempty"`
 	Intake           map[string]string `json:"intake,omitempty"`
+	// IntakeLabels maps Intake keys to the service's declared field labels.
+	IntakeLabels     map[string]string `json:"intakeLabels,omitempty"`
 	StartsAt         time.Time `json:"startsAt"`
 	EndsAt           time.Time `json:"endsAt"`
 	Status           string    `json:"status"`
@@ -545,6 +547,8 @@ type CustomerBookingView struct {
 	Status        string    `json:"status"`
 	Notes         string    `json:"notes,omitempty"`
 	Intake        map[string]string `json:"intake,omitempty"`
+	// IntakeLabels maps Intake keys to the service's declared field labels.
+	IntakeLabels  map[string]string `json:"intakeLabels,omitempty"`
 	// WaitlistPosition is the 1-based queue spot for waitlisted class
 	// bookings; zero for any other status.
 	WaitlistPosition int `json:"waitlistPosition,omitempty"`
@@ -624,6 +628,27 @@ type StaffMetricsResponse struct {
 	Staff []StaffMetric `json:"staff"`
 }
 
+// ServiceMetric aggregates appointment bookings for one catalog service over
+// a trailing window. Revenue counts non-cancelled bookings at list price.
+type ServiceMetric struct {
+	ServiceID    string `json:"serviceId"`
+	Name         string `json:"name"`
+	Bookings     int    `json:"bookings"`
+	Completed    int    `json:"completed"`
+	Cancelled    int    `json:"cancelled"`
+	RevenueCents int64  `json:"revenueCents"`
+}
+
+type ServiceMetricsResponse struct {
+	From time.Time `json:"from"`
+	To   time.Time `json:"to"`
+	// Services lists every catalog service, including zero rows.
+	Services []ServiceMetric `json:"services"`
+	// ClassBookings counts session bookings in the window; they carry no
+	// service or price so they are reported separately.
+	ClassBookings int `json:"classBookings"`
+}
+
 // ============================================
 // ADMIN MODELS
 // ============================================