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

backend/src/v1/agent/utils.py

@@ -24,7 +24,6 @@ def convert_message_to_history(
 
     转换规则：
     - role=user: 读取 metadata.user_message_attachments，转换为 attachments[]
-    - role=tool: 读取 content 和 metadata.tool_agent_output.ui_hints，编译成 ui_schema
     - role=assistant: 读取 metadata.worker_agent_output.ui_hints，编译成 ui_schema
     """
     role = message.role
@@ -37,9 +36,6 @@ def convert_message_to_history(
     if role == "user":
         attachments = _convert_user_attachments(metadata, get_signed_url_fn)
 
-    elif role == "tool":
-        ui_schema = _compile_tool_ui_hints(metadata)
-
     elif role == "assistant":
         ui_schema = _compile_worker_ui_hints(metadata)
 
@@ -92,47 +88,6 @@ def _convert_user_attachments(
     return signed_attachments
 
 
-def _compile_tool_ui_hints(
-    metadata: AgentChatMessageMetadata | dict[str, Any] | None,
-) -> dict[str, Any] | None:
-    """编译 tool 消息的 ui_hints"""
-    if not metadata:
-        return None
-
-    if isinstance(metadata, AgentChatMessageMetadata):
-        tool_output = metadata.tool_agent_output
-    else:
-        tool_output_data = metadata.get("tool_agent_output")
-        if not tool_output_data:
-            return None
-        if isinstance(tool_output_data, dict):
-            raw_ui_schema = tool_output_data.get("ui_schema")
-            if isinstance(raw_ui_schema, dict):
-                return raw_ui_schema
-            legacy_ui_schema = tool_output_data.get("uiSchema")
-            if isinstance(legacy_ui_schema, dict):
-                return legacy_ui_schema
-        from schemas.agent.runtime_models import ToolAgentOutput
-
-        try:
-            tool_output = ToolAgentOutput.model_validate(tool_output_data)
-        except Exception:
-            return None
-
-    if not tool_output:
-        return None
-
-    ui_hints = tool_output.ui_hints
-    if not ui_hints:
-        return None
-
-    try:
-        compiled = compile_ui_hints(ui_hints)
-        return compiled
-    except Exception:
-        return None
-
-
 def _compile_worker_ui_hints(
     metadata: AgentChatMessageMetadata | dict[str, Any] | None,
 ) -> dict[str, Any] | None: