feat: 更新 Java SDK 模板并添加 JavaScript 和 TypeScript SDK 模板

- 更新 Java SDK 模板的变量文件，移除 projectName 和 description 字段，添加 author 字段
- 新建 JavaScript SDK模板的变量文件，包含 packageName、version 和 author 字段
- 新建 TypeScript SDK 模板的变量文件，包含 packageName、version 和 author 字段

Author: cjbi

src/main/templates/java_sdk/.flexmodel/variables.json

@@ -1,8 +1,7 @@
 {
   "packageName": "com.example",
   "path": "com/example",
-  "projectName": "java-sdk",
-  "description": "Java SDK",
+  "author": "Flexmodel Team",
   "version": "1.0.0",
   "groupId": "com.example",
   "artifactId": "java-sdk-sample"

src/main/templates/javascript_sdk/.flexmodel/variables.json

@@ -0,0 +1,5 @@
+{
+  "packageName": "flexmodel-javascript-sdk",
+  "version": "1.0.0",
+  "author": "Flexmodel Team"
+}

src/main/templates/typescript_sdk/.flexmodel/variables.json

@@ -0,0 +1,5 @@
+{
+  "packageName": "flexmodel-typescript-sdk",
+  "version": "1.0.0",
+  "author": "Flexmodel Team"
+}