feat: 添加微信端 API 文档和字典表初始化脚本

- 新增 openapi-wx.yaml 文件，定义微信端接口文档，包括用户统计、token 刷新、微信登录和用户资料更新等接口。
- 新增 pocketbase.dictionary.js 脚本，用于初始化和校验字典表结构，确保与预期一致。

script/pocketbase.documents.js

@@ -26,7 +26,7 @@ const collections = [
         type: 'base',
         fields: [
             { name: 'attachments_id', type: 'text', required: true },
-            { name: 'attachments_link', type: 'file', maxSelect: 0, maxSize: 104857600, mimeTypes: [] },
+            { name: 'attachments_link', type: 'file', maxSelect: 0, maxSize: 4294967296, mimeTypes: [] },
             { name: 'attachments_filename', type: 'text' },
             { name: 'attachments_filetype', type: 'text' },
             { name: 'attachments_size', type: 'number' },