refactor(auth): 优化JWT令牌创建方法

- 移除CreateJwtToken2方法，统一使用CreateJwtToken方法
- 修改密钥处理方式，从ASCII字符串改为Base64解码
- 删除IssuedAt声明以简化令牌结构
- 更新所有相关调用点使用统一的令牌创建方法

UnitTestProject/BasicTests/AuthHelperTest.cs

@@ -21,7 +21,7 @@ namespace YLErp.BasicTests
         public void TestGenerateToken()
         {
             var identity = UserManager.CreateIdentity("1", "superA", Guid.NewGuid().ToString(""));
-            var jwtToken2 = AuthHelper.CreateJwtToken2(identity);
+            var jwtToken2 = AuthHelper.CreateJwtToken(identity);
             var jwtTokenHandler = new JwtSecurityTokenHandler();
             var token = jwtTokenHandler.ReadJwtToken(jwtToken2);
             Assert.Fail();

YLErpDAL/Helpers/AuthHelper.cs

@@ -29,41 +29,10 @@ namespace YLErp.Helpers
 
         public const string JwtUserToken = "###jwt###";
 
-        /// <summary>
-        /// 创建jwt令牌
-        /// </summary>
         public static string CreateJwtToken(ClaimsIdentity identity)
-        {
-            var key = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(JwtSecretKey));
-
-            // 添加 JTI (JWT ID) 用于黑名单机制
-            var claims = new ClaimsIdentity(identity);
-            if (!claims.HasClaim(c => c.Type == "jti"))
-            {
-                claims.AddClaim(new Claim("jti", Guid.NewGuid().ToString("N")));
-            }
-
-            var tokenDescriptor = new SecurityTokenDescriptor
-            {
-                Subject = claims,
-                Expires = DateTime.UtcNow.AddSeconds(ExpireInSeconds),
-                Issuer = JwtIssuer,
-                Audience = JwtAudience,
-                SigningCredentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha512Signature)
-            };
-
-            var tokenHandler = new JwtSecurityTokenHandler();
-
-            var token = tokenHandler.CreateToken(tokenDescriptor);
-
-            return tokenHandler.WriteToken(token);
-        }
-
-        public static string CreateJwtToken2(ClaimsIdentity identity)
         {
             var key = new SymmetricSecurityKey(Convert.FromBase64String(JwtSecretKey));
 
-            // 添加 JTI (JWT ID) 用于黑名单机制
             var claims = new ClaimsIdentity(identity);
             if (!claims.HasClaim(c => c.Type == "jti"))
             {
@@ -74,7 +43,6 @@ namespace YLErp.Helpers
             {
                 Subject = claims,
                 Expires = DateTime.UtcNow.AddSeconds(ExpireInSeconds),
-                IssuedAt = DateTime.Now,
                 Issuer = JwtIssuer,
                 Audience = JwtAudience,
                 SigningCredentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha512)

YLErpWeb/Controllers/AccountController.cs

@@ -264,7 +264,7 @@ namespace YLErp.Web.Controllers
             Response.Cookies.Delete("Access-Token");
             Response.Cookies.Delete("Access-Token-Encrypt");
             
-            var jwtToken = AuthHelper.CreateJwtToken2(identity);
+            var jwtToken = AuthHelper.CreateJwtToken(identity);
             Response.Cookies.Append("Access-Token", jwtToken, new CookieOptions
             {
                 MaxAge = TimeSpan.FromSeconds(AuthHelper.ExpireInSeconds)

YLErpWeb/Middleware/RefreshTokenMiddleware.cs

@@ -134,7 +134,7 @@ namespace YLErp.Web.Middleware
                             var identity = UserManager.CreateIdentity(userId, userName, userToken);
                             
                             // 生成新的token
-                            var newToken = AuthHelper.CreateJwtToken2(identity);
+                            var newToken = AuthHelper.CreateJwtToken(identity);
                             
                             // 更新cookie
                             context.Response.Cookies.Append("Access-Token", newToken, new CookieOptions