refactor: 重构 Tool Result 契约，移除 ui_hints 统一使用 result 字段

- ToolAgentOutput 移除 result_summary 和 ui_hints，统一使用 result 字段
- 日历/用户查找工具移除 ui_hints 输出，改为机器可读的结构化结果
- Agent History 移除 tool 消息的 ui_hints 处理逻辑
- App 版本检查改为 manifest.json 方式，支持多渠道发布
- 更新 settings 配置和测试用例适配新结构

deploy/static/releases/manifest.json

@@ -0,0 +1,26 @@
+{
+  "releases": [
+    {
+      "platform": "android",
+      "channel": "release",
+      "version_name": "0.1.0",
+      "version_code": 1,
+      "min_supported_version_code": 1,
+      "file_name": "social-app-android-v0.1.0+1-release.apk",
+      "release_notes": "\u95ee\u9898\u4fee\u590d\u548c\u4f53\u9a8c\u4f18\u5316",
+      "file_size": 21371504,
+      "sha256": "6cf53601f36e0037b6de909ea3567d1e18a1bcec1164e1b70d88c1802eafd44b"
+    },
+    {
+      "platform": "android",
+      "channel": "release",
+      "version_name": "0.1.0",
+      "version_code": 2,
+      "min_supported_version_code": 2,
+      "file_name": "social-app-android-v0.1.0+2-release.apk",
+      "release_notes": "\u95ee\u9898\u4fee\u590d\u548c\u4f53\u9a8c\u4f18\u5316",
+      "file_size": 21371504,
+      "sha256": "8f769bda3ba5414dfd5712ac026d8a13663990b7e83a4e92b8e85caf9945d5eb"
+    }
+  ]
+}