feat: member portal Sprint 6 — Seva + multi-signal gamification

- SevaOpportunity + SevaEntry + GamificationEvent models + migration
- GamificationService: multi-signal point table (helpful answer +10, seva +20,
  event +5, FAQ +15, welcome +3, profile +5, business +5), idempotent award via
  unique(userId,type,refId), lifetime + time-decayed "recent" score, leaderboard
- SevaModule: admin CRUD + mark-entry-complete (awards SEVA_COMPLETED points)
- Member endpoints in MyController: GET /my/seva, POST /my/seva/:id/signup|cancel
- PROFILE_COMPLETED auto-awarded on profile update (name+hometown+interest)
- /my/seva page: points hero with per-type breakdown, open opportunities w/ signup,
  leaderboard (respects directoryVisible), my seva history
- Member + admin BFF routes; Seva & Points nav item
- Register GamificationModule + SevaModule; add SEVA_* audit actions

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

apps/web/app/api/admin/seva/[id]/route.ts

@@ -0,0 +1,28 @@
+import { apiFetch, jsonResponse } from '../../../../_lib/api';
+
+export const dynamic = 'force-dynamic';
+
+export async function PATCH(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> },
+): Promise<Response> {
+  const { id } = await params;
+  const body = await request.json();
+  const res = await apiFetch(`/admin/seva/${id}`, {
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  });
+  const resBody = await res.json();
+  return jsonResponse(resBody, res.status);
+}
+
+export async function DELETE(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> },
+): Promise<Response> {
+  const { id } = await params;
+  const res = await apiFetch(`/admin/seva/${id}`, { method: 'DELETE' });
+  const resBody = await res.json();
+  return jsonResponse(resBody, res.status);
+}