feat(knowledge): 知识库 wiki/知识图谱重构，新增发布广场选择弹窗

- 知识库页拆分出 wiki 组件（侧边栏/目录树/Markdown 阅读器等）
- 知识图谱页拆分出 knowledge-graph 组件并增强交互
- 新增发布广场选择弹窗 publish-square-picker-dialog
- config.yaml 新增 MiniMax-M2.5 / Ling-flash-2.0 / DeepSeek-V4-Pro 模型

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

frontend-web/src/core/knowledge/hooks.ts

@@ -10,6 +10,7 @@ import {
   deleteKnowledgeNote,
   exportKnowledgeGraph,
   fetchVaultPage,
+  getKnowledgeGraph,
   getKnowledgeNote,
   ingestKnowledgeFile,
   ingestThread,
@@ -71,6 +72,14 @@ export function useKnowledgeSearch(query: string, enabled: boolean) {
   });
 }
 
+export function useKnowledgeGraph() {
+  return useQuery({
+    queryKey: [...ROOT_KEY, "graph"],
+    queryFn: getKnowledgeGraph,
+    refetchOnWindowFocus: false,
+  });
+}
+
 export function useKnowledgeActions() {
   const queryClient = useQueryClient();
   const invalidate = () =>