feat(auth): Gateway JwtUtil 增加 userType 解析支持

- 新增三参数 generateToken 方法，支持传入 userType
- 旧方法默认 userType=ADMIN，保持向后兼容
- 新增 getUserTypeFromToken 方法解析 Token 中的 userType

gym-manage-api/manage-gateway/src/main/java/cn/novalon/gym/manage/gateway/util/JwtUtil.java

@@ -28,6 +28,10 @@ public class JwtUtil {
     }
 
     public String generateToken(String username, Long userId) {
+        return generateToken(username, userId, "ADMIN");
+    }
+
+    public String generateToken(String username, Long userId, String userType) {
         Date now = new Date();
         Date expiryDate = new Date(now.getTime() + expiration);
 
@@ -35,13 +39,14 @@ public class JwtUtil {
             String token = Jwts.builder()
                     .setSubject(username)
                     .claim("userId", userId)
+                    .claim("userType", userType)
                     .claim("keyVersion", jwtKeyService.getCurrentKeyVersion())
                     .setIssuedAt(now)
                     .setExpiration(expiryDate)
                     .signWith(getSigningKey())
                     .compact();
             
-            logger.debug("Generated JWT token for user: {}, userId: {}", username, userId);
+            logger.debug("Generated JWT token for user: {}, userId: {}, userType: {}", username, userId, userType);
             return token;
             
         } catch (Exception e) {
@@ -74,6 +79,11 @@ public class JwtUtil {
         return claims.get("userId", Long.class);
     }
 
+    public String getUserTypeFromToken(String token) {
+        Claims claims = parseToken(token);
+        return claims.get("userType", String.class);
+    }
+
     public boolean validateToken(String token) {
         try {
             parseToken(token);