feat: member portal Sprint 10 — Knowledge Base

- KnowledgeBoard + KnowledgeItem models + migration (DRAFT/PUBLISHED/ARCHIVED status, slug per tenant)
- KnowledgeModule: admin CRUD for boards + items (auto-slug, status workflow)
- Member endpoint GET /my/knowledge?q= — published items grouped by board, optional text search over question/answer
- /my/knowledge page: search box + collapsible boards with accordion FAQ items
- KnowledgeItem accordion + KnowledgeSearch (debounced URL-driven) client components
- Knowledge nav item; register KnowledgeModule

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

apps/web/app/my/knowledge/KnowledgeSearch.tsx

@@ -0,0 +1,30 @@
+'use client';
+
+import { useRouter, useSearchParams } from 'next/navigation';
+import { useEffect, useState } from 'react';
+
+export function KnowledgeSearch() {
+  const router = useRouter();
+  const searchParams = useSearchParams();
+  const [q, setQ] = useState(searchParams.get('q') ?? '');
+
+  useEffect(() => {
+    const handle = setTimeout(() => {
+      const params = new URLSearchParams();
+      if (q.trim()) params.set('q', q.trim());
+      router.replace(`/my/knowledge${params.toString() ? `?${params.toString()}` : ''}`);
+    }, 300);
+    return () => clearTimeout(handle);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [q]);
+
+  return (
+    <input
+      type="text"
+      value={q}
+      onChange={(e) => setQ(e.target.value)}
+      placeholder="Search the knowledge base…"
+      className="w-full rounded-lg border border-gray-300 px-3 py-2.5 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-500"
+    />
+  );
+}