feat(cli): add ms microservice template support

1. 新增`ms`微服务模板，包含共享项目、微服务、网关、应用等完整架构
2. 为`hua new`命令添加`ms`模板选项并更新文档
3. 将模板文件嵌入CLI项目输出目录
4. 实现微服务模板的项目构建逻辑，自动安装并使用dotnet自定义模板创建项目

templates/ms/.template.config/template.json

@@ -0,0 +1,35 @@
+{
+  "$schema": "http://json.schemastore.org/template",
+  "author": "Hua",
+  "classifications": ["Hua", "Microservice", "Web", "Solution"],
+  "identity": "Hua.Microservice.Template",
+  "name": "Hua Microservice Solution",
+  "shortName": "hua-ms",
+  "sourceName": "Company.Project",
+  "preferNameDirectory": true,
+  "tags": {
+    "language": "C#",
+    "type": "project"
+  },
+  "symbols": {
+    "databaseProvider": {
+      "type": "parameter",
+      "datatype": "choice",
+      "choices": [
+        { "choice": "ef", "description": "Entity Framework Core" }
+      ],
+      "defaultValue": "ef",
+      "description": "Database provider"
+    },
+    "uiFramework": {
+      "type": "parameter",
+      "datatype": "choice",
+      "choices": [
+        { "choice": "mvc", "description": "ASP.NET Core MVC" },
+        { "choice": "none", "description": "No UI" }
+      ],
+      "defaultValue": "mvc",
+      "description": "UI framework"
+    }
+  }
+}