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/middleware/admin_middleware.go

@@ -0,0 +1,30 @@
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"dating-app/internal/models"
+	"dating-app/internal/utils"
+)
+
+// AdminRequired باید بعد از AuthRequired استفاده بشه. فقط کاربرانی که IsAdmin=true
+// دارن اجازه‌ی عبور دارن.
+func AdminRequired() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		userVal, exists := c.Get(ContextUserKey)
+		if !exists {
+			utils.Fail(c, http.StatusUnauthorized, "احراز هویت لازم است", nil)
+			c.Abort()
+			return
+		}
+		user, ok := userVal.(*models.User)
+		if !ok || !user.IsAdmin {
+			utils.Fail(c, http.StatusForbidden, "دسترسی فقط برای ادمین است", nil)
+			c.Abort()
+			return
+		}
+		c.Next()
+	}
+}