feat: AG-UI 协议对齐与路由导航功能

- 前端: 添加 SSE 流式支持、stateSnapshot 事件、路由导航工具
- 前端: 实现工具调用审批流程，支持 pending 状态展示
- 后端: Agent 状态管理与会话持久化相关重构
- 文档: 新增 agent-agui-full-alignance 设计文档
- 测试: 补充相关单元测试和集成测试

docs/runtime/runtime-route.md

@@ -714,43 +714,29 @@
 **Request:**
 ```json
 {
-  "session_id": "string? (optional, 为空时自动创建会话)",
-  "prompt": "string (1-5000 chars)"
+  "threadId": "string (UUID, required)",
+  "runId": "string (required)",
+  "parentRunId": "string? (optional)",
+  "state": {},
+  "messages": [
+    {
+      "id": "string",
+      "role": "user",
+      "content": "string | InputContent[]"
+    }
+  ],
+  "tools": [],
+  "context": [],
+  "forwardedProps": {}
 }
 ```
 
 **Response:** 202 Accepted
 ```json
 {
-  "task_id": "string",
-  "session_id": "string",
-  "created": true
-}
-```
-
-**Errors:**
-- 401: 未认证
-- 403: 非会话 owner
-- 422: 请求参数无效
-
----
-
-### POST /agent/runs/{session_id}/resume
-
-恢复一次等待工具结果的 Agent 运行（需要认证）。
-
-**Request:**
-```json
-{
-  "tool_call_id": "string"
-}
-```
-
-**Response:** 202 Accepted
-```json
-{
-  "task_id": "string",
-  "session_id": "string",
+  "taskId": "string",
+  "threadId": "string",
+  "runId": "string",
   "created": false
 }
 ```
@@ -762,12 +748,54 @@
 
 ---
 
-### GET /agent/runs/{session_id}/events
+### POST /agent/runs/{thread_id}/resume
+
+恢复一次等待工具结果的 Agent 运行（需要认证）。
+
+**Request:**
+```json
+{
+  "threadId": "string (must match path thread_id)",
+  "runId": "string",
+  "parentRunId": "string? (optional)",
+  "state": {},
+  "messages": [
+    {
+      "id": "string",
+      "role": "tool",
+      "toolCallId": "string",
+      "content": "string (JSON string, AG-UI ToolMessage content)"
+    }
+  ],
+  "tools": [],
+  "context": [],
+  "forwardedProps": {}
+}
+```
+
+**Response:** 202 Accepted
+```json
+{
+  "taskId": "string",
+  "threadId": "string",
+  "runId": "string",
+  "created": false
+}
+```
+
+**Errors:**
+- 401: 未认证
+- 403: 非会话 owner
+- 422: 请求参数无效
+
+---
+
+### GET /agent/runs/{thread_id}/events
 
 订阅 Agent SSE 事件流（需要认证）。
 
 **Headers:**
-- `Last-Event-ID` (optional): 断点续传游标
+- `Last-Event-ID` (optional): 断点续传游标，格式 `^\d+-\d+$`
 
 **Response:** 200 OK
 `Content-Type: text/event-stream`
@@ -775,7 +803,7 @@
 ```text
 id: 2-0
 event: RUN_STARTED
-data: {"session_id":"..."}
+data: {"type":"RUN_STARTED","threadId":"...","runId":"..."}
 
 ```
 
@@ -785,6 +813,59 @@ data: {"session_id":"..."}
 
 ---
 
+### GET /agent/runs/{thread_id}/history
+
+按“天”读取指定会话的历史快照（需要认证）。
+
+**Query:**
+- `before` (optional, `YYYY-MM-DD`): 读取该日期之前的最近一天
+
+**Response:** 200 OK
+```json
+{
+  "type": "STATE_SNAPSHOT",
+  "threadId": "string",
+  "snapshot": {
+    "scope": "history_day",
+    "threadId": "string",
+    "day": "2026-03-07",
+    "hasMore": true,
+    "messages": []
+  }
+}
+```
+
+**Errors:**
+- 401: 未认证
+- 403: 非会话 owner
+
+---
+
+### GET /agent/history
+
+读取当前用户历史快照（需要认证）。当未传 `threadId` 时，默认返回最近活跃会话的按天快照。
+
+**Query:**
+- `threadId` (optional): 指定会话
+- `before` (optional, `YYYY-MM-DD`): 读取该日期之前的最近一天
+
+**Response:** 200 OK
+```json
+{
+  "type": "STATE_SNAPSHOT",
+  "threadId": "string?",
+  "snapshot": {
+    "scope": "history_day",
+    "threadId": "string?",
+    "day": "2026-03-07",
+    "hasMore": false,
+    "messages": []
+  }
+}
+```
+
+---
+
 ## Infra
 
 ### GET /infra/health