feat: chat integration, tenant admin spec, backend chat service, miniprogram updates, DEMO moved to tmp, XCX-TEST removed, migrations & docs

docs/prd/Neo_Specs/storyboard-walkthrough-assistant-view.md

@@ -602,7 +602,7 @@ AbandonedTask 字段：
 | `name` | string | 客户名 | ✅ |
 | `initial` | string | 姓名首字 | ❌ |
 | `avatarGradient` | string | 头像渐变色 | ❌ |
-| `heartEmoji` | string | 爱心 emoji `❤️/💛/🤍` | ❌ |
+| `heartEmoji` | string | 爱心 emoji `💖/🧡/💛/💙` | ❌ |
 | `score` | string | 关系指数 `'9.5'` | ❌ 契约有 `total_spend`/`visit_count` 但无 score |
 | `scoreColor` | string | 指数颜色 | ❌ |
 | `serviceCount` | number | 服务次数 | ⚠️ 契约有 `visit_count` |