feat: 知识库实体筛选、技能白名单收紧、嵌入主题与提问组件优化

- 知识库笔记列表支持按实体精确筛选（路由/服务/仓储层透传，关系图索引查询）
- 自定义智能体技能白名单在 skill_view 与 skill_manage 的 list/view 别名上同样生效；
  config 未声明 skills 时视为无可见技能
- 嵌入圆桌主题解析默认深蓝，强制主题期间不再写 localStorage 覆盖主站选择
- 智能体提问建议拆出 agent-question-chips 组件，编辑器与详情面板联动优化
- 新增 qa-client 问答测试脚本

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend-web/src/pages/EmbedChatPage.tsx

@@ -4,13 +4,9 @@ import { useSearchParams } from "next/navigation";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { useParams } from "react-router-dom";
 
-import { useTheme } from "@/contexts/ThemeContext";
 import { loginByUsername } from "@/core/auth/api";
 import { setStoredAuth } from "@/core/auth";
-import {
-  resolveEmbedChatParams,
-  resolveEmbedTheme,
-} from "@/core/embed/params";
+import { resolveEmbedChatParams } from "@/core/embed/params";
 import { registerEmbedSession } from "@/core/embed/status-api";
 import { useThreadSettings } from "@/core/settings";
 import { useThreadStream } from "@/core/threads/hooks";
@@ -29,7 +25,8 @@ const EMBED_ROUTE_BASE = "/embed/chats";
 export default function EmbedChatPage() {
   const { thread_id: threadIdFromPath } = useParams<{ thread_id: string }>();
   const searchParams = useSearchParams();
-  const { setTheme } = useTheme();
+  // 主题不在这里处理 —— ?theme= 由 AppProviders 通过 forcedTheme 强制
+  // （不落 localStorage），避免污染主站用户自己选的主题。
   const embedParams = resolveEmbedChatParams(searchParams.toString());
   const [authReady, setAuthReady] = useState(false);
   const [authError, setAuthError] = useState<string | null>(null);
@@ -51,12 +48,6 @@ export default function EmbedChatPage() {
   const [settings] = useThreadSettings(threadId);
   const { tokenUsageEnabled } = useModels();
 
-  useEffect(() => {
-    if (embedParams.theme) {
-      setTheme(resolveEmbedTheme(embedParams.theme));
-    }
-  }, [embedParams.theme, setTheme]);
-
   useEffect(() => {
     let cancelled = false;
     async function runLogin() {