Add photo upload as a real onboarding step

Photos are now step 2 of onboarding (right after basic info) instead
of only being manageable from the profile page later. Uploading still
goes through the existing /profile/photos endpoint; the new
POST /onboarding/photos just confirms at least one photo exists and
advances the step counter. Renumbered the OnboardingStep enum
accordingly (9 steps total now).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/handler/onboarding_handler.go

@@ -66,6 +66,19 @@ func (h *OnboardingHandler) BasicInfo(c *gin.Context) {
 	utils.Success(c, http.StatusOK, "اطلاعات پایه ثبت شد", h.onboardingService.GetStatus(user))
 }
 
+// Photos POST /onboarding/photos — تایید مرحله‌ی عکس‌ها (خودِ آپلود از /profile/photos انجام می‌شه)
+func (h *OnboardingHandler) Photos(c *gin.Context) {
+	user, ok := currentUser(c)
+	if !ok {
+		return
+	}
+	if err := h.onboardingService.ConfirmPhotos(user); err != nil {
+		h.handleStepError(c, err)
+		return
+	}
+	utils.Success(c, http.StatusOK, "عکس‌ها ثبت شد", h.onboardingService.GetStatus(user))
+}
+
 // BodyInfo POST /onboarding/body-info
 func (h *OnboardingHandler) BodyInfo(c *gin.Context) {
 	user, ok := currentUser(c)