fix: improve UX and fix admin console display issues

Miniprogram:
- Add back buttons to all custom-nav pages
- Add debug/mock buttons (BLE connect, wear check, treatment)
  controlled by __DEV__ flag (hidden in prod)

Admin console:
- Fix log page using nonexistent fields (operator_type, target_type)
  now correctly reads admin_id/user_id/action/detail from API
- Fix subscription date fields (started_at→start_time, expired_at→expire_time)
- Wire up subscription detail/extend/renew action buttons
- Wire up device detail "查看完整日志" button
- Add "创建订阅" button to subscription toolbar
- Fix subscription status mapping (2=expired, 3=cancelled)

Docs:
- Add detailed architecture docs for server, miniprogram, admin console

admin-console/src/pages/log/index.vue

@@ -15,15 +15,15 @@
 
     <view class="page-card">
       <view class="log-list">
-        <view class="log-item" v-for="item in logs" :key="item.id">
+        <view class="log-item" v-for="item in logs" :key="item.log_id">
           <text class="log-time">{{ formatDate(item.created_at) }}</text>
           <view class="log-content">
-            <text :class="logTypeBadge(item.operator_type)">{{ logTypeText(item.operator_type) }}</text>
+            <text :class="actorBadge(item)">{{ actorLabel(item) }}</text>
             <text class="log-text">
-              <text class="log-actor" :class="logActorClass(item.operator_type)">{{ item.operator_type === 1 ? '管理员' : '系统' }}</text>
-              对 <text class="log-target">{{ item.target_type }} {{ item.target_id || '' }}</text>
-              执行了 <text class="log-action">{{ item.action }}</text>
+              <text class="log-action">{{ actionLabel(item.action) }}</text>
+              <text class="log-detail" v-if="item.detail"> — {{ item.detail }}</text>
             </text>
+            <text class="log-meta" v-if="item.ip">IP: {{ item.ip }}</text>
           </view>
         </view>
       </view>
@@ -60,6 +60,11 @@ export default {
       return Math.ceil(this.total / this.pageSize) || 1
     }
   },
+  onLoad(options) {
+    if (options && options.device_id) {
+      this.filters.device_id = options.device_id
+    }
+  },
   onShow() {
     this.loadLogs()
   },
@@ -84,20 +89,24 @@ export default {
       this.page = p
       this.loadLogs()
     },
-    logTypeText(type) {
-      if (type === 1) return '管理操作'
-      if (type === 2) return '系统事件'
-      return '用户操作'
+    actorLabel(item) {
+      if (item.admin_id) return '管理员 #' + item.admin_id
+      if (item.user_id) return '用户 #' + item.user_id
+      return '系统'
     },
-    logTypeBadge(type) {
-      if (type === 1) return 'badge badge-pink'
-      if (type === 2) return 'badge badge-blue'
-      return 'badge badge-green'
+    actorBadge(item) {
+      if (item.admin_id) return 'badge badge-pink'
+      if (item.user_id) return 'badge badge-green'
+      return 'badge badge-blue'
     },
-    logActorClass(type) {
-      if (type === 1) return 'actor-admin'
-      if (type === 2) return 'actor-system'
-      return 'actor-user'
+    actionLabel(action) {
+      var map = {
+        admin_login: '管理员登录', admin_device_create: '创建设备', admin_device_unbind: '后台解绑',
+        admin_device_command: '下发指令', user_register: '用户注册', user_login: '用户登录',
+        device_bind: '设备绑定', device_unbind: '设备解绑', treatment_sync: '护理记录同步',
+        subscription_verify: '订阅核销'
+      }
+      return map[action] || action
     },
     formatDate: formatDateUtil,
     async onExport() {
@@ -170,29 +179,18 @@ export default {
   color: #666;
 }
 
-.log-actor {
-  font-weight: 600;
-}
-
-.actor-admin {
-  color: #E6508C;
-}
-
-.actor-system {
-  color: #1890ff;
-}
-
-.actor-user {
-  color: #52c41a;
-}
-
-.log-target {
-  color: #333;
-  font-weight: 500;
-}
-
 .log-action {
   color: #333;
   font-weight: 500;
 }
+
+.log-detail {
+  color: #999;
+}
+
+.log-meta {
+  font-size: 12px;
+  color: #bbb;
+  margin-top: 2px;
+}
 </style>