feat(ui): add ButlerPanel — pain points, proposals, memory insights

- Add Butler types (PainPoint, Proposal, DelegationResult) to viking-client.ts
- Add butler API functions: getButlerInsights, getButlerProposals,
  recordButlerPainPoint, generateButlerSolution, updateButlerProposalStatus,
  butlerDelegateTask
- Create ButlerPanel with three sections:
  - InsightsSection: pain point cards with evidence chain, severity, confidence
  - ProposalsSection: solution cards with accept/reject actions
  - MemorySection: Viking memory entries per agent
- Create useButlerInsights hook for data fetching
- Add "管家" tab to RightPanel with ConciergeBell icon

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/components/ButlerPanel/MemorySection.tsx

@@ -0,0 +1,71 @@
+import { useState, useEffect } from 'react';
+import { Brain, Loader2 } from 'lucide-react';
+import { listVikingResources } from '../../lib/viking-client';
+
+interface MemorySectionProps {
+  agentId: string;
+}
+
+interface MemoryEntry {
+  uri: string;
+  name: string;
+  resourceType: string;
+}
+
+export function MemorySection({ agentId }: MemorySectionProps) {
+  const [memories, setMemories] = useState<MemoryEntry[]>([]);
+  const [loading, setLoading] = useState(false);
+
+  useEffect(() => {
+    if (!agentId) return;
+
+    setLoading(true);
+    listVikingResources(`viking://agents/${agentId}/memories/`)
+      .then((entries) => {
+        setMemories(entries as MemoryEntry[]);
+      })
+      .catch(() => {
+        // Memory path may not exist yet — show empty state
+        setMemories([]);
+      })
+      .finally(() => setLoading(false));
+  }, [agentId]);
+
+  if (loading) {
+    return (
+      <div className="flex items-center justify-center py-8">
+        <Loader2 className="w-5 h-5 text-gray-400 animate-spin" />
+      </div>
+    );
+  }
+
+  if (memories.length === 0) {
+    return (
+      <div className="text-center py-8">
+        <Brain className="w-8 h-8 mx-auto mb-2 text-gray-300 dark:text-gray-600" />
+        <p className="text-sm text-gray-500 dark:text-gray-400">暂无记忆</p>
+        <p className="text-xs text-gray-400 dark:text-gray-500 mt-1">
+          管家会在对话中自动积累对您的了解
+        </p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-2">
+      {memories.map((memory) => (
+        <div
+          key={memory.uri}
+          className="rounded-lg border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 px-3 py-2"
+        >
+          <div className="text-sm text-gray-900 dark:text-gray-100 truncate">
+            {memory.name}
+          </div>
+          <div className="text-xs text-gray-400 dark:text-gray-500 truncate mt-0.5">
+            {memory.uri}
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}