feat: WeChat Pay integration, translation quota management, login UX fixes

- WeChat Pay APIv3 integration (JSAPI + Native) with cert-based auth
- TranslationQuota model + admin management UI (配额 tab)
- Alibaba MT provider now checks quota before translation
- Fix: admin tabs scrollable on mobile, remove header-card
- Fix: profile/login navigation - logout stays on profile, login returns to profile
- Fix: login form now visible by default (no extra click to show)
- Fix: home page translate link uses navigateTo (was switchTab to non-tabBar page)
- Add .coverage and apiclient_key.pem to gitignore

uni-app/src/utils/api.js

@@ -178,6 +178,11 @@ export const adminApi = {
   },
   getConfig: () => request('/admin/config'),
   updateConfig: (key, value) => request(`/admin/config/${key}`, 'PUT', { value }),
+  getTranslationQuotas: () => request('/admin/translation-quotas'),
+  updateTranslationQuota: (version, data) =>
+    request(`/admin/translation-quotas/${encodeURIComponent(version)}`, 'PUT', data),
+  resetTranslationQuota: (version) =>
+    request(`/admin/translation-quotas/${encodeURIComponent(version)}/reset`, 'POST'),
 }
 
 export const aiChatApi = {
@@ -230,7 +235,8 @@ export const notificationApi = {
 export const paymentApi = {
   plans: () => request('/payment/plans'),
   subscription: () => request('/payment/subscription'),
-  createOrder: (plan) => request('/payment/create-order', 'POST', { plan }),
+  createOrder: (plan, payType = 'jsapi') =>
+    request('/payment/create-order', 'POST', { plan, pay_type: payType }),
 }
 
 export const feedbackApi = {