Initial commit: dating app backend (Go/Gin/GORM/Postgres)

Phone+OTP auth, staged onboarding, admin approval workflow, and a
full discovery/swipe/match/chat system with photo upload and
approximate distance (haversine) based on user location.

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

internal/dto/profile_dto.go

@@ -0,0 +1,7 @@
+package dto
+
+// UpdateLocationRequest به‌روزرسانی موقعیت مکانی کاربر (برای محاسبه‌ی فاصله‌ی تقریبی)
+type UpdateLocationRequest struct {
+	Latitude  float64 `json:"latitude" binding:"required"`
+	Longitude float64 `json:"longitude" binding:"required"`
+}