feat(intake): structured per-service intake questions

Services declare up to 8 intake fields (text/yesno, required) stored
as JSONB; shared/intake.go is the single normalization point — slug
keys, label/dup/unknown-key rules, yes/no canonicalization. Booking
create validates answers against the service declaration (missing
required -> 400), unknown keys are dropped before persist.

Answers surface on UpcomingBooking and CustomerBookingView; the
services page gains a compact editor and the public form renders
declared questions under contact details. Verified live end-to-end.

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

@@ -26,6 +26,7 @@ type UpcomingBooking struct {
 	Location         string    `json:"location,omitempty"`
 	StaffName        string    `json:"staffName,omitempty"`
 	Notes            string    `json:"notes,omitempty"`
+	Intake           map[string]string `json:"intake,omitempty"`
 	StartsAt         time.Time `json:"startsAt"`
 	EndsAt           time.Time `json:"endsAt"`
 	Status           string    `json:"status"`
@@ -135,10 +136,11 @@ type PublicAvailability struct {
 }
 
 type PublicService struct {
-	ID              string `json:"id"`
-	Name            string `json:"name"`
-	DurationMinutes int    `json:"durationMinutes"`
-	PriceCents      int    `json:"priceCents"`
+	ID              string        `json:"id"`
+	Name            string        `json:"name"`
+	DurationMinutes int           `json:"durationMinutes"`
+	PriceCents      int           `json:"priceCents"`
+	IntakeFields    []IntakeField `json:"intakeFields,omitempty"`
 }
 
 type PublicStaff struct {
@@ -163,6 +165,9 @@ type CreateBookingRequest struct {
 	CustomerEmail  string  `json:"customerEmail"`
 	CustomerPhone  string  `json:"customerPhone,omitempty"`
 	Notes          string  `json:"notes"`
+	// Intake carries structured intake answers keyed by the service's
+	// declared IntakeField keys; only declared keys are stored.
+	Intake         map[string]string `json:"intake,omitempty"`
 	StartsAt       string  `json:"startsAt"`
 	EndsAt         string  `json:"endsAt"`
 }
@@ -295,31 +300,44 @@ type UpdateLocationRequest struct {
 // SERVICE MODELS
 // ============================================
 
+// IntakeField is one structured intake question a service asks at booking
+// time. Key is a slug (lowercase alnum + underscore) used as the JSON key in
+// booking intake answers; Type is "text" or "yesno".
+type IntakeField struct {
+	Key      string `json:"key"`
+	Label    string `json:"label"`
+	Type     string `json:"type"`
+	Required bool   `json:"required,omitempty"`
+}
+
 type Service struct {
-	ID                  string    `json:"id"`
-	TenantID            string    `json:"tenantId"`
-	Name                string    `json:"name"`
-	DurationMinutes     int       `json:"durationMinutes"`
-	BufferBeforeMinutes int       `json:"bufferBeforeMinutes"`
-	BufferAfterMinutes  int       `json:"bufferAfterMinutes"`
-	PriceCents          int       `json:"priceCents"`
-	CreatedAt           time.Time `json:"createdAt"`
+	ID                  string        `json:"id"`
+	TenantID            string        `json:"tenantId"`
+	Name                string        `json:"name"`
+	DurationMinutes     int           `json:"durationMinutes"`
+	BufferBeforeMinutes int           `json:"bufferBeforeMinutes"`
+	BufferAfterMinutes  int           `json:"bufferAfterMinutes"`
+	PriceCents          int           `json:"priceCents"`
+	IntakeFields        []IntakeField `json:"intakeFields,omitempty"`
+	CreatedAt           time.Time     `json:"createdAt"`
 }
 
 type CreateServiceRequest struct {
-	Name                string `json:"name" binding:"required"`
-	DurationMinutes     int    `json:"durationMinutes" binding:"required"`
-	BufferBeforeMinutes int    `json:"bufferBeforeMinutes,omitempty"`
-	BufferAfterMinutes  int    `json:"bufferAfterMinutes,omitempty"`
-	PriceCents          int    `json:"priceCents,omitempty"`
+	Name                string        `json:"name" binding:"required"`
+	DurationMinutes     int           `json:"durationMinutes" binding:"required"`
+	BufferBeforeMinutes int           `json:"bufferBeforeMinutes,omitempty"`
+	BufferAfterMinutes  int           `json:"bufferAfterMinutes,omitempty"`
+	PriceCents          int           `json:"priceCents,omitempty"`
+	IntakeFields        []IntakeField `json:"intakeFields,omitempty"`
 }
 
 type UpdateServiceRequest struct {
-	Name                *string `json:"name,omitempty"`
-	DurationMinutes     *int    `json:"durationMinutes,omitempty"`
-	BufferBeforeMinutes *int    `json:"bufferBeforeMinutes,omitempty"`
-	BufferAfterMinutes  *int    `json:"bufferAfterMinutes,omitempty"`
-	PriceCents          *int    `json:"priceCents,omitempty"`
+	Name                *string       `json:"name,omitempty"`
+	DurationMinutes     *int          `json:"durationMinutes,omitempty"`
+	BufferBeforeMinutes *int          `json:"bufferBeforeMinutes,omitempty"`
+	BufferAfterMinutes  *int          `json:"bufferAfterMinutes,omitempty"`
+	PriceCents          *int          `json:"priceCents,omitempty"`
+	IntakeFields        *[]IntakeField `json:"intakeFields,omitempty"`
 }
 
 // ============================================
@@ -526,6 +544,7 @@ type CustomerBookingView struct {
 	Location      string    `json:"location"`
 	Status        string    `json:"status"`
 	Notes         string    `json:"notes,omitempty"`
+	Intake        map[string]string `json:"intake,omitempty"`
 	// WaitlistPosition is the 1-based queue spot for waitlisted class
 	// bookings; zero for any other status.
 	WaitlistPosition int `json:"waitlistPosition,omitempty"`