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/auth_middleware.go

@@ -0,0 +1,51 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+
+	"dating-app/internal/repository"
+	"dating-app/internal/utils"
+)
+
+const (
+	ContextUserKey = "current_user"
+)
+
+// AuthRequired توکن access رو از هدر Authorization می‌خونه، اعتبارسنجی می‌کنه
+// و کاربر مربوطه رو توی context قرار می‌ده.
+func AuthRequired(jwtManager *utils.JWTManager, userRepo *repository.UserRepository) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		header := c.GetHeader("Authorization")
+		if header == "" || !strings.HasPrefix(header, "Bearer ") {
+			utils.Fail(c, http.StatusUnauthorized, "توکن احراز هویت ارسال نشده است", nil)
+			c.Abort()
+			return
+		}
+
+		tokenStr := strings.TrimPrefix(header, "Bearer ")
+		claims, err := jwtManager.ParseAccessToken(tokenStr)
+		if err != nil {
+			utils.Fail(c, http.StatusUnauthorized, "توکن نامعتبر یا منقضی شده است", nil)
+			c.Abort()
+			return
+		}
+
+		user, err := userRepo.FindByID(claims.UserID)
+		if err != nil {
+			utils.Fail(c, http.StatusUnauthorized, "کاربر یافت نشد", nil)
+			c.Abort()
+			return
+		}
+		if !user.IsActive {
+			utils.Fail(c, http.StatusForbidden, "حساب کاربری غیرفعال است", nil)
+			c.Abort()
+			return
+		}
+
+		c.Set(ContextUserKey, user)
+		c.Next()
+	}
+}