feat(meeting): Task 15 UI 打磨 + 主持人四件套 + 媒体层稳定性回归修复

- Task 15 UI：6 项原创特色（说话者流光 / 柔性网格 / 自视频浮窗 / 静音氛围色 / 入会滑入 / NetworkBadge 3 条波浪）+ 说话者双源探测（RTP audioLevel + WebAudio RMS）+ 主持人四件套（静音/开麦/转让/踢出）
- 新增 SelfVideoFloat 浮窗组件 + 4 份 design-system 页面文档（home / preview / room / invite）
- 媒体回归补丁（手工联调触发）：
  * 后端 signal_service 在 OnRoomJoin 追加 pushExistingRoomState → 向新加入者补发历史 producers + 历史成员 audio/video 状态
  * 新增 Redis Hash memberStateKey 持久化成员 audio/video enabled，OnMemberStateChanged 落盘、cleanupUserResources 清理
  * 前端 _broadcastSelfState 在本地音视频开关末尾同步 state.changed；_afterJoined 先 getRoom 再 room.join 修复后入者成员状态时序；_onMemberStateChanged 占位兜底
  * _cleanupRemoteProducer 改为按 producerId 精准清理（修复 "关音频误关视频"）
  * _onRoomEnded + createAndEnter/joinAndEnter 强化 reset（修复重入会看不到自己画面）
  * mediasoup-client ensureSend/RecvTransport 引入 in-flight Promise 锁防并发重复建连
- 文档同步：CURRENT_STATUS.md / Task 15 plan / phase2e-2 implementation plan

Made-with: Cursor

frontend/package-lock.json

@@ -37,6 +37,7 @@
         "@dcloudio/uni-cli-shared": "3.0.0-4080720251210001",
         "@dcloudio/uni-stacktracey": "3.0.0-4080720251210001",
         "@dcloudio/vite-plugin-uni": "3.0.0-4080720251210001",
+        "@vitejs/plugin-basic-ssl": "^2.3.0",
         "@vue/runtime-core": "^3.4.21",
         "sass": "^1.97.3",
         "vite": "5.2.8"
@@ -4443,6 +4444,19 @@
       "integrity": "sha512-GsCCIZDE/p3i96vtEqx+7dBUGXrc7zeSK3wwPHIaRThS+9OhWIXRqzs4d6k1SVU8g91DrNRWxWUGhp5KXQb2VA==",
       "license": "MIT"
     },
+    "node_modules/@vitejs/plugin-basic-ssl": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@vitejs/plugin-basic-ssl/-/plugin-basic-ssl-2.3.0.tgz",
+      "integrity": "sha512-bdyo8rB3NnQbikdMpHaML9Z1OZPBu6fFOBo+OtxsBlvMJtysWskmBcnbIDhUqgC8tcxNv/a+BcV5U+2nQMm1OQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "peerDependencies": {
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      }
+    },
     "node_modules/@vitejs/plugin-legacy": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/@vitejs/plugin-legacy/-/plugin-legacy-5.3.2.tgz",