refactor: 移除提示词模板页面及相关接口，精简岗位/标签/用户提示词模型

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

frontend-web/src/pages/PromptTemplatesPage.tsx

@@ -1,5 +0,0 @@
-import { PromptTemplatesPage as PromptTemplatesManagement } from "@/components/workspace/admin/prompt-templates-page";
-
-export default function PromptTemplatesPage() {
-  return <PromptTemplatesManagement />;
-}

frontend-web/src/pages/StrategyRoutes.tsx

@@ -41,7 +41,6 @@ import ScheduledTasksPage from "./ScheduledTasksPage";
 import SkillEvolutionPage from "./SkillEvolutionPage";
 import SkillsPage from "./SkillsPage";
 import PositionsPage from "./PositionsPage";
-import PromptTemplatesPage from "./PromptTemplatesPage";
 import TagsPage from "./TagsPage";
 import UsersPage from "./UsersPage";
 import LlmMetricsPage from "./LlmMetricsPage";
@@ -299,16 +298,6 @@ export default function StrategyRoutes() {
                 )
               }
             />
-            <Route
-              path="admin/prompt-templates"
-              element={
-                getStoredAuth()?.system_role === "admin" ? (
-                  <PromptTemplatesPage />
-                ) : (
-                  <Navigate to="/page/workspace/chats/new" replace />
-                )
-              }
-            />
           </Routes>
         </div>
       </SidebarProvider>

frontend-web/src/pages/WorkspaceRoutes.tsx

@@ -40,7 +40,6 @@ import AdminMemoryPage from './AdminMemoryPage';
 import AdminUserHubPage from './AdminUserHubPage';
 import TagsPage from './TagsPage';
 import PositionsPage from './PositionsPage';
-import PromptTemplatesPage from './PromptTemplatesPage';
 import RecommendedQuestionsPage from './RecommendedQuestionsPage';
 import AIWritingPage from '@/open-canvas/pages/AIWritingPage';
 import StudioNotebooksPage from './StudioNotebooksPage';
@@ -487,18 +486,6 @@ export default function WorkspaceRoutes({
             )
           }
         />
-        <Route
-          path="admin/prompt-templates"
-          element={
-            getStoredAuth()?.system_role === 'admin' ? (
-              <WorkspaceLayout {...layoutProps}>
-                <PromptTemplatesPage />
-              </WorkspaceLayout>
-            ) : (
-              <Navigate to="/page/workspace/chats/new" replace />
-            )
-          }
-        />
         <Route
           path="settings/recommended-questions"
           element={