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/my/seva/[id]/cancel/route.ts

@@ -0,0 +1,13 @@
+import { jsonResponse, memberApiFetch } from '../../../../../_lib/api';
+
+export const dynamic = 'force-dynamic';
+
+export async function POST(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> },
+): Promise<Response> {
+  const { id } = await params;
+  const res = await memberApiFetch(`/my/seva/${id}/cancel`, { method: 'POST' });
+  const body = await res.json();
+  return jsonResponse(body, res.status);
+}

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

@@ -0,0 +1,13 @@
+import { jsonResponse, memberApiFetch } from '../../../../../_lib/api';
+
+export const dynamic = 'force-dynamic';
+
+export async function POST(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> },
+): Promise<Response> {
+  const { id } = await params;
+  const res = await memberApiFetch(`/my/seva/${id}/signup`, { method: 'POST' });
+  const body = await res.json();
+  return jsonResponse(body, res.status);
+}