fix: 区分 SqlSugarScope 和 SqlSugarClient 使用场景

区分：
- GetSqlSugarScope(): 返回 SqlSugarScope，用于 DI 注入（Singleton）
- GetSqlSugarClient(): 返回 SqlSugarClient，用于后台任务（每次创建新实例）

原因：
- SqlSugarScope 使用 AsyncLocal 隔离上下文
- Task.Run 后台线程中 AsyncLocal 可能无法正确传递
- 后台任务使用 SqlSugarClient 更安全，每个实例独立连接

使用：
- DI 注入：GetSqlSugarScope()
- Repository 后台写入：GetSqlSugarClient()
- MySQL 连接池复用底层 TCP 连接，性能开销小

AssetManager.Data/DatabaseExtensions.cs

@@ -12,7 +12,7 @@ public static class DatabaseExtensions
         // 使用 Singleton 注册，整个应用共享一个实例
         services.AddSingleton<ISqlSugarClient>(s =>
         {
-            return SqlSugarConfig.GetSqlSugarClient();
+            return SqlSugarConfig.GetSqlSugarScope();
         });
 
         services.AddScoped<DatabaseService>();

AssetManager.Data/SqlSugarConfig.cs

@@ -15,6 +15,9 @@ public static class SqlSugarConfig
         _configuration = configuration;
     }
 
+    /// <summary>
+    /// 获取 SqlSugarClient 实例（用于后台任务，每次创建新实例）
+    /// </summary>
     public static ISqlSugarClient GetSqlSugarClient()
     {
         if (_configuration == null)
@@ -22,36 +25,41 @@ public static class SqlSugarConfig
             throw new InvalidOperationException("SqlSugarConfig has not been initialized. Call Initialize() first.");
         }
 
-        // 优先从环境变量读取连接字符串
+        var connectionString = GetConnectionString();
-        var connectionString = Environment.GetEnvironmentVariable("ConnectionStrings__Default")
-            ?? _configuration.GetConnectionString("Default")
-            ?? throw new InvalidOperationException("Connection string 'Default' not found in environment variables or configuration.");
 
-        // MySQL 连接池优化配置
+        // 使用 SqlSugarClient（非 Scope），每次创建独立实例
-        // 添加连接池参数提高稳定性
+        // 适合后台任务、Task.Run 场景
-        if (!connectionString.Contains("Pooling=", StringComparison.OrdinalIgnoreCase))
+        return new SqlSugarClient(new ConnectionConfig()
         {
-            connectionString += ";Pooling=true";
+            ConnectionString = connectionString,
-        }
+            DbType = DbType.MySql,
-        if (!connectionString.Contains("MaximumPoolSize=", StringComparison.OrdinalIgnoreCase))
+            IsAutoCloseConnection = true,
+            InitKeyType = InitKeyType.Attribute,
+            ConfigureExternalServices = new ConfigureExternalServices
+            {
+                EntityService = (property, column) =>
+                {
+                    if (property.PropertyType == typeof(DateTime))
+                    {
+                        column.DataType = "datetime(3)";
+                    }
+                }
+            }
+        });
+    }
+
+    /// <summary>
+    /// 获取 SqlSugarScope 实例（用于 DI 注入，Singleton/Scoped）
+    /// </summary>
+    public static ISqlSugarClient GetSqlSugarScope()
+    {
+        if (_configuration == null)
         {
-            connectionString += ";MaximumPoolSize=100";
+            throw new InvalidOperationException("SqlSugarConfig has not been initialized. Call Initialize() first.");
-        }
-        if (!connectionString.Contains("MinimumPoolSize=", StringComparison.OrdinalIgnoreCase))
-        {
-            connectionString += ";MinimumPoolSize=5";
-        }
-        // 连接超时和生命周期
-        if (!connectionString.Contains("ConnectionTimeout=", StringComparison.OrdinalIgnoreCase))
-        {
-            connectionString += ";ConnectionTimeout=30";
-        }
-        // 连接空闲超时，避免使用长时间空闲的连接
-        if (!connectionString.Contains("ConnectionIdleTimeout=", StringComparison.OrdinalIgnoreCase))
-        {
-            connectionString += ";ConnectionIdleTimeout=180";
         }
 
+        var connectionString = GetConnectionString();
+
         return new SqlSugarScope(new ConnectionConfig()
         {
             ConnectionString = connectionString,
@@ -70,4 +78,35 @@ public static class SqlSugarConfig
             }
         });
     }
+
+    private static string GetConnectionString()
+    {
+        var connectionString = Environment.GetEnvironmentVariable("ConnectionStrings__Default")
+            ?? _configuration!.GetConnectionString("Default")
+            ?? throw new InvalidOperationException("Connection string 'Default' not found in environment variables or configuration.");
+
+        // MySQL 连接池优化配置
+        if (!connectionString.Contains("Pooling=", StringComparison.OrdinalIgnoreCase))
+        {
+            connectionString += ";Pooling=true";
+        }
+        if (!connectionString.Contains("MaximumPoolSize=", StringComparison.OrdinalIgnoreCase))
+        {
+            connectionString += ";MaximumPoolSize=100";
+        }
+        if (!connectionString.Contains("MinimumPoolSize=", StringComparison.OrdinalIgnoreCase))
+        {
+            connectionString += ";MinimumPoolSize=5";
+        }
+        if (!connectionString.Contains("ConnectionTimeout=", StringComparison.OrdinalIgnoreCase))
+        {
+            connectionString += ";ConnectionTimeout=30";
+        }
+        if (!connectionString.Contains("ConnectionIdleTimeout=", StringComparison.OrdinalIgnoreCase))
+        {
+            connectionString += ";ConnectionIdleTimeout=180";
+        }
+
+        return connectionString;
+    }
 }