feat: 完善知识图谱交互与 Agent/线程持久化

- 知识图谱画布、侧边栏、详情面板交互优化，新增图谱相关 API 与 hooks
- Agent 卡片与详情面板调整，对话页面重构
- 线程元数据持久化增强（base/memory/sql），knowledge 仓储与导出补充
- 网关路由 agents/knowledge/threads 同步更新

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

frontend-web/src/components/knowledge-graph/GraphSidebar.tsx

@@ -1,6 +1,8 @@
-import { ChevronDown, ChevronRight, Search, X } from "lucide-react";
+import { ChevronDown, ChevronRight, Eraser, Search, X } from "lucide-react";
 import { useState } from "react";
 
+import type { GraphBlacklistItem } from "@/core/knowledge/api";
+
 import type { GraphNode, GraphStats, NodeKind } from "./graphTypes";
 import {
   getEdgeInfo,
@@ -19,16 +21,26 @@ interface GraphSidebarProps {
   stats: GraphStats;
   topNodes: Array<{ node: GraphNode; degree: number }>;
   hiddenCount: number;
+  blacklistItems: GraphBlacklistItem[];
+  blacklistPending: boolean;
+  junkCandidateCount: number;
   onSearchChange: (keyword: string) => void;
   onSearchEnter: () => void;
   onToggleNodeKind: (kind: NodeKind) => void;
   onToggleEdgeLabel: (label: string) => void;
   onRestoreHidden: () => void;
+  onRemoveBlacklist: (entryId: string) => void;
+  onCleanJunk: () => void;
   onPickNode: (id: string) => void;
   onClose: () => void;
 }
 
-type SectionKey = "nodeTypes" | "edgeTypes" | "graphStats" | "coreNodes";
+type SectionKey =
+  | "nodeTypes"
+  | "edgeTypes"
+  | "graphStats"
+  | "coreNodes"
+  | "blacklist";
 
 interface FilterSectionProps {
   title: string;
@@ -69,6 +81,7 @@ export function GraphSidebar(props: GraphSidebarProps) {
     edgeTypes: true,
     graphStats: false,
     coreNodes: false,
+    blacklist: true,
   });
 
   const toggleFilterSection = (key: SectionKey) => {
@@ -230,6 +243,49 @@ export function GraphSidebar(props: GraphSidebarProps) {
             ))}
           </FilterSection>
         ) : null}
+
+        <FilterSection
+          title="图谱黑名单"
+          extra={`${props.blacklistItems.length} 个`}
+          collapsed={collapsedSections.blacklist}
+          onToggle={() => toggleFilterSection("blacklist")}
+        >
+          <div className="kg-search-hint">
+            黑名单中的主题 / 节点不会出现在图谱中。可在节点详情里加入黑名单。
+          </div>
+          <button
+            type="button"
+            className="kg-icon-button"
+            disabled={props.blacklistPending || props.junkCandidateCount === 0}
+            title="将单字符、纯数字符号、通用泛词等低价值主题批量加入黑名单"
+            onClick={props.onCleanJunk}
+          >
+            <Eraser size={13} /> 清理低价值主题
+            {props.junkCandidateCount > 0 ? `(${props.junkCandidateCount})` : ""}
+          </button>
+          {props.blacklistItems.length === 0 ? (
+            <div className="kg-search-hint">暂无黑名单条目。</div>
+          ) : (
+            props.blacklistItems.map((item) => (
+              <div key={item.id} className="kg-check-row">
+                <span className="kg-check-row-main">
+                  <span className="kg-check-label" title={item.label}>
+                    {item.label}
+                  </span>
+                </span>
+                <button
+                  type="button"
+                  className="kg-text-button"
+                  disabled={props.blacklistPending}
+                  title="移出黑名单,重新显示该节点"
+                  onClick={() => props.onRemoveBlacklist(item.id)}
+                >
+                  移除
+                </button>
+              </div>
+            ))
+          )}
+        </FilterSection>
       </div>
     </aside>
   );