fix: backend port 3001 -> 3002 to match Caddy upstream config

Caddy routes /api/* and /webhooks/* to 172.20.1.238:3002 but the
docker-compose had PORT=3001 and bound port 3001. Changed:
- PORT env var: 3001 -> 3002
- Port binding: 0.0.0.0:3002:3002
- Health check: localhost:3002/health
- Next.js rewrites: localhost:3001 -> localhost:3002
- Frontend port: 127.0.0.1 -> 0.0.0.0 (Caddy remote access)

docker-compose.prod.yml

@@ -73,7 +73,7 @@ services:
       - NODE_ENV=production
       - DATABASE_URL=postgresql://coop:${POSTGRES_PASSWORD:-coop_secure_password}@postgres:5432/coop_credits?schema=public
       - REDIS_URL=redis://:${REDIS_PASSWORD:-redis_secure_password}@redis:6379
-      - PORT=3001
+      - PORT=3002
       - JWT_SECRET=${JWT_SECRET}
       - API_URL=https://coop.hobokenchicken.com
       - FRONTEND_URL=https://coop.hobokenchicken.com
@@ -97,7 +97,7 @@ services:
       - ENCRYPTION_KEY=${ENCRYPTION_KEY}
       - TRUST_PROXY=true
     ports:
-      - "127.0.0.1:3001:3001"  # Only accessible via Nginx
+      - "0.0.0.0:3002:3002"  # Only accessible via Nginx
     depends_on:
       postgres:
         condition: service_healthy
@@ -115,7 +115,7 @@ services:
         max-file: "5"
     # Health check
     healthcheck:
-      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:3001/health"]
+      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:3002/health"]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -139,7 +139,7 @@ services:
       - NEXT_PUBLIC_SOLANA_NETWORK=devnet
       - NEXT_PUBLIC_SOLANA_RPC_URL=https://api.devnet.solana.com
     ports:
-      - "127.0.0.1:3000:3000"  # Only accessible via Nginx
+      - "0.0.0.0:3000:3000"  # Only accessible via Nginx
     depends_on:
       - backend
     networks:

frontend/next-env.d.ts

@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/dev/types/routes.d.ts";
+import "./.next/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

frontend/next.config.js

@@ -6,11 +6,11 @@ const nextConfig = {
     return [
       {
         source: '/api/:path*',
-        destination: 'http://localhost:3001/api/:path*',
+        destination: 'http://localhost:3002/api/:path*',
       },
       {
         source: '/webhooks/:path*',
-        destination: 'http://localhost:3001/webhooks/:path*',
+        destination: 'http://localhost:3002/webhooks/:path*',
       },
     ];
   },