feat: 新增流程总览图页面及导航功能

添加流程总览图页面，包含五组十域可交互SVG流程图，支持模块点击跳转至对应流程详情页。同时在侧边栏和首页添加导航入口，优化流程详情页的返回逻辑和布局样式。

src/App.tsx

@@ -6,6 +6,7 @@ import { ProcessGroupsPage } from './pages/ProcessGroupsPage'
 import { ProcessDetailPage } from './pages/ProcessDetailPage'
 import { ProcessMatrixPage } from './pages/ProcessMatrixPage'
 import { ProcessGraphPage } from './pages/ProcessGraphPage'
+import { ProcessRoadmapPage } from './pages/ProcessRoadmapPage'
 import { ArtifactDetailPage } from './pages/ArtifactDetailPage'
 import { ToolDetailPage } from './pages/ToolDetailPage'
 import { SettingsPage } from './pages/SettingsPage'
@@ -21,6 +22,7 @@ function App() {
         <Route path="/process-groups/:id" element={<ProcessGroupsPage />} />
         <Route path="/process/:id" element={<ProcessDetailPage />} />
         <Route path="/process-matrix" element={<ProcessMatrixPage />} />
+        <Route path="/process-roadmap" element={<ProcessRoadmapPage />} />
         <Route path="/process-graph" element={<ProcessGraphPage />} />
         <Route path="/artifact/:id" element={<ArtifactDetailPage />} />
         <Route path="/tool/:id" element={<ToolDetailPage />} />