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/api/src/modules/my/my.controller.ts

@@ -1,5 +1,6 @@
 import { Body, Controller, Delete, Get, Param, Patch, Post } from '@nestjs/common';
 import { MyService } from './my.service';
+import { SevaService } from '../seva/seva.service';
 import { MemberAuth } from '../auth/member-auth.decorator';
 import { CurrentMember } from '../auth/current-member.decorator';
 import type { MemberJwtPayload } from '@tower/types';
@@ -22,7 +23,25 @@ class OptInDto {
 @Controller('my')
 @MemberAuth()
 export class MyController {
-  constructor(private readonly service: MyService) {}
+  constructor(
+    private readonly service: MyService,
+    private readonly seva: SevaService,
+  ) {}
+
+  @Get('seva')
+  sevaList(@CurrentMember() member: MemberJwtPayload) {
+    return this.seva.listForMember(member.sub, member.tenantId);
+  }
+
+  @Post('seva/:id/signup')
+  sevaSignup(@CurrentMember() member: MemberJwtPayload, @Param('id') id: string) {
+    return this.seva.signup(member.sub, member.tenantId, id);
+  }
+
+  @Post('seva/:id/cancel')
+  sevaCancel(@CurrentMember() member: MemberJwtPayload, @Param('id') id: string) {
+    return this.seva.cancel(member.sub, member.tenantId, id);
+  }
 
   @Get('dashboard')
   dashboard(@CurrentMember() member: MemberJwtPayload) {