feat(admin,partner): Tencent map location picker and expose LBS key

Store create/edit on HQ and partner can pick coords via Tencent locpicker; client-config exposes TENCENT_LBS_KEY; seed empty system settings from env.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/shared-types/src/wechat.ts

@@ -31,6 +31,8 @@ export type ClientRuntimeConfig = {
   mockWechat?: boolean;
   /** false 时三端跳过微信 SDK OAuth 授权（由 MOCK_WECHAT 或真实凭证推导） */
   wxAuthorize?: boolean;
+  /** 腾讯位置服务 Key（地图选点组件，可按域名限制） */
+  tencentLbsKey?: string;
   /** 小程序首页轮播 / 底部图 */
   miniHome?: {
     banners: string[];