Initial commit: add RainOpsMini project and documentation

Models/PluginConfigEntity.cs

@@ -0,0 +1,17 @@
+using SqlSugar;
+using System;
+
+namespace RainOpsMini.Models
+{
+    [SugarTable("PluginConfigs")]
+    public class PluginConfigEntity
+    {
+        [SugarColumn(IsPrimaryKey = true)]
+        public string PluginName { get; set; } = null!;
+
+        [SugarColumn(ColumnDataType = "TEXT")]
+        public string JsonContent { get; set; } = "{}";
+
+        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+    }
+}