feat: production readiness — feature gaps + config hardening

Miniprogram:
- Add BLE reconnect button on home page when disconnected
- Add loading states to index, profile, subscribe-plans pages
- Add profile editing (avatar + nickname) with COS upload
- Enable pull-to-refresh on history page
- Fix auto-scan self.options → self.data inconsistency
- Add console.error to silent catch blocks
- Gate 'Simple Peripheral' BLE scan behind __DEV__ flag
- Add production config comment to env.js

Admin console:
- Add empty state '暂无数据' to all 5 list views
- Replace plain text plan input with select dropdown
- Add type="date" to record date filters
- Add production config comment

Server:
- CORS origin restricted in production (env CORS_ORIGIN)
- DB pool size configurable via DB_POOL_SIZE env var
- .env.example updated with WeChat Pay + production fields

miniprogram/pages/profile/profile.wxss

@@ -107,11 +107,144 @@
   color: #999;
 }
 
+.loading-container {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: 200rpx 0;
+}
+
+.loading-spinner {
+  width: 64rpx;
+  height: 64rpx;
+  border: 6rpx solid #f0f0f0;
+  border-top-color: #E6508C;
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
+.loading-text {
+  margin-top: 20rpx;
+  font-size: 28rpx;
+  color: #999;
+}
+
 .sub-card-inactive {
   background: #f5f5f5;
   border: 1px dashed #d9d9d9;
 }
 
+.user-avatar-img {
+  width: 88rpx;
+  height: 88rpx;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.edit-profile-btn {
+  font-size: 24rpx;
+  color: rgba(255, 255, 255, 0.9);
+  border: 1rpx solid rgba(255, 255, 255, 0.6);
+  border-radius: 24rpx;
+  padding: 6rpx 20rpx;
+  flex-shrink: 0;
+}
+
+.edit-mask {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.5);
+  z-index: 100;
+}
+
+.edit-modal {
+  position: fixed;
+  left: 10%;
+  right: 10%;
+  top: 50%;
+  transform: translateY(-50%);
+  background: #fff;
+  border-radius: 24rpx;
+  padding: 40rpx;
+  z-index: 101;
+}
+
+.edit-modal-title {
+  font-size: 32rpx;
+  font-weight: 600;
+  text-align: center;
+  margin-bottom: 32rpx;
+  color: #333;
+}
+
+.edit-avatar-row {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  margin-bottom: 32rpx;
+}
+
+.edit-avatar-img {
+  width: 120rpx;
+  height: 120rpx;
+  border-radius: 50%;
+}
+
+.edit-avatar-placeholder {
+  width: 120rpx;
+  height: 120rpx;
+  background: #f5f5f5;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 56rpx;
+}
+
+.edit-avatar-hint {
+  font-size: 24rpx;
+  color: #999;
+  margin-top: 12rpx;
+}
+
+.edit-field {
+  margin-bottom: 32rpx;
+}
+
+.edit-label {
+  font-size: 26rpx;
+  color: #666;
+  margin-bottom: 12rpx;
+  display: block;
+}
+
+.edit-input {
+  border: 2rpx solid #e0e0e0;
+  border-radius: 12rpx;
+  padding: 16rpx 20rpx;
+  font-size: 28rpx;
+  color: #333;
+}
+
+.edit-actions {
+  display: flex;
+  gap: 20rpx;
+}
+
+.edit-btn {
+  flex: 1;
+  margin: 0 !important;
+  font-size: 28rpx;
+}
+
 .logout-btn {
   text-align: center;
   color: #ff4d4f;