refactor: migrate from raw pgx to GORM, unify ErrNoRows, cleanup auth

internal/auth/auth.go

@@ -29,12 +29,16 @@ func GenerateToken(userID, email string, secret []byte, expiration time.Duration
 }
 
 func ValidateToken(tokenString string, secret []byte) (*Claims, error) {
-	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(t *jwt.Token) (interface{}, error) {
-		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
-			return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
-		}
-		return secret, nil
-	})
+	token, err := jwt.ParseWithClaims(
+		tokenString,
+		&Claims{},
+		func(t *jwt.Token) (interface{}, error) {
+			if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
+			}
+			return secret, nil
+		},
+	)
 	if err != nil {
 		return nil, err
 	}