feat: member portal Sprint 9 — Ask AI (RAG over message archive)

- AskAIQuery model + migration (logs question/answer/citations per member)
- AskAIService: RAG pipeline — retrieve via tenant-isolated SearchService (Meili),
  ground LLM in top-8 snippets with inline [n] citations, degrade gracefully when
  OPENROUTER_API_KEY absent or no context (snippet fallback)
- Shared api/common/llm-client.ts (mirrors worker's OpenRouter client)
- SearchModule now exports SearchService
- Member endpoints: GET/POST /my/ask (history + ask)
- /my/ask page + AskChat client component: question box, answer cards with sources
- Ask AI nav item (top of member nav)

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

apps/web/app/my/ask/page.tsx

@@ -0,0 +1,49 @@
+import { getMemberToken, getApiBaseUrl } from '../../_lib/api';
+import { AskChat } from './AskChat';
+import Link from 'next/link';
+
+interface Citation {
+  messageId: string;
+  snippet: string;
+  senderName: string;
+  sourceGroupName: string;
+  approvedAt: number;
+}
+
+interface QA {
+  id: string;
+  question: string;
+  answer: string;
+  citations: Citation[];
+  createdAt: string;
+}
+
+async function fetchHistory(token: string): Promise<QA[]> {
+  const res = await fetch(`${getApiBaseUrl()}/my/ask`, {
+    headers: { Authorization: `Bearer ${token}` },
+    cache: 'no-store',
+  }).catch(() => null);
+  if (!res || !res.ok) return [];
+  return (await res.json()) as QA[];
+}
+
+export default async function AskPage() {
+  const token = await getMemberToken();
+  if (!token) return null;
+
+  const history = await fetchHistory(token);
+
+  return (
+    <div className="max-w-2xl mx-auto space-y-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-xl font-semibold text-gray-900">Ask AI</h1>
+          <p className="text-sm text-gray-500 mt-0.5">Answers from your community&apos;s knowledge.</p>
+        </div>
+        <Link href="/my" className="text-sm text-indigo-600 hover:underline">← Dashboard</Link>
+      </div>
+
+      <AskChat initialHistory={history} />
+    </div>
+  );
+}