feat(整合): 新增十二项原则页面，支持查看表格与打字填空练习

src/App.tsx

@@ -10,6 +10,7 @@ import { ArtifactDetailPage } from './pages/ArtifactDetailPage'
 import { ToolDetailPage } from './pages/ToolDetailPage'
 import { SettingsPage } from './pages/SettingsPage'
 import ProcessPracticePage from './pages/ProcessPracticePage'
+import PrinciplesPage from './pages/PrinciplesPage'
 
 function App() {
   return (
@@ -24,6 +25,7 @@ function App() {
         <Route path="/process-matrix" element={<ProcessMatrixPage />} />
         <Route path="/process-graph" element={<ProcessGraphPage />} />
         <Route path="/process-practice" element={<ProcessPracticePage />} />
+        <Route path="/principles" element={<PrinciplesPage />} />
         <Route path="/artifact/:id" element={<ArtifactDetailPage />} />
         <Route path="/tool/:id" element={<ToolDetailPage />} />
         <Route path="/settings" element={<SettingsPage />} />