feat: 任务工作区可配置跳转按钮(按钮管理) + 底部快捷跳转栏 + 目的树收起/空自动问答

- 新增「按钮管理」admin 页(/admin/task-buttons)：按业务(rwfx/3qfx/xdfx)配置跳转按钮，
  支持改名称/类型(外链·切换业务·目的树弹框)/目标/追加参数名(id·task_id)/任务id·行动id/启停/排序
- 跳转按钮从左侧栏移到工作区底部「快捷跳转」栏：红底白字、靠右、变大；rwfx 历史 4 按钮纳入配置
- 后端新增全局共享 store /api/task-buttons (table task_buttons，admin 整体替换)
- xdfx 行动id/任务id：登录暂存原始行动id，按钮可选追加任一；id 参数名可自定义
- rwfx 清除记录移到「新建对话」下、去掉任务操作框；查询任务目的为空时自动发第一次问答
- 目的树面板默认收起；「弹框查看」抽成可复用 TaskPurposeDialog，可作为按钮配置到任意页面
- 文档(根/后端 CLAUDE.md) + 后端测试 tests/test_task_buttons.py

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/pages/StrategyRoutes.tsx

@@ -39,6 +39,7 @@ import LightAppListPage from "./LightAppListPage";
 import LightAppManagementPage from "./LightAppManagementPage";
 import MenuManagementPage from "./MenuManagementPage";
 import SensitiveWordsPage from "./SensitiveWordsPage";
+import TaskButtonsPage from "./TaskButtonsPage";
 import LightAppNewNotePage from "./LightAppNewNotePage";
 import LightAppNoteListPage from "./LightAppNoteListPage";
 import LightAppNoteQAPage from "./LightAppNoteQAPage";
@@ -135,7 +136,7 @@ export default function StrategyRoutes() {
               <Route
                 path="plan-task-sentiment/agent/:agent_id/chats"
                 element={
-                  <TaskFxWorkspace taskBase="/page/strategy/task-management/plan-task-sentiment" lite />
+                  <TaskFxWorkspace taskBase="/page/strategy/task-management/plan-task-sentiment" business="3qfx" lite />
                 }
               >
                 <Route
@@ -174,7 +175,7 @@ export default function StrategyRoutes() {
               <Route
                 path="plan-task/plan-task-fx/agent/:agent_id/chats"
                 element={
-                  <TaskFxWorkspace taskBase="/page/strategy/task-management/plan-task/plan-task-fx" />
+                  <TaskFxWorkspace taskBase="/page/strategy/task-management/plan-task/plan-task-fx" business="rwfx" />
                 }
               >
                 <Route
@@ -186,7 +187,10 @@ export default function StrategyRoutes() {
                 <Route
                   path=":thread_id"
                   element={
-                    <TaskFxChat taskBase="/page/strategy/task-management/plan-task/plan-task-fx" />
+                    <TaskFxChat
+                      taskBase="/page/strategy/task-management/plan-task/plan-task-fx"
+                      autoStartWhenPurposeEmpty
+                    />
                   }
                 />
               </Route>
@@ -214,7 +218,7 @@ export default function StrategyRoutes() {
               <Route
                 path="plan-task/plan-task-action/agent/:agent_id/chats"
                 element={
-                  <TaskFxWorkspace taskBase="/page/strategy/task-management/plan-task/plan-task-action" lite />
+                  <TaskFxWorkspace taskBase="/page/strategy/task-management/plan-task/plan-task-action" business="xdfx" lite />
                 }
               >
                 <Route
@@ -367,6 +371,16 @@ export default function StrategyRoutes() {
                 )
               }
             />
+            <Route
+              path="admin/task-buttons"
+              element={
+                getStoredAuth()?.system_role === "admin" ? (
+                  <TaskButtonsPage />
+                ) : (
+                  <Navigate to="/page/workspace/chats/new" replace />
+                )
+              }
+            />
             <Route
               path="admin/scheduled-tasks"
               element={