Initial fullstack project setup with Next.js 15, Gin, PostgreSQL and Docker Compose

- Frontend: Next.js 15 (App Router), Auth.js v5, shadcn/ui, MagicUI
- Backend: Go + Gin + GORM with layered architecture
- Auth: Local credentials login with optional Keycloak OAuth binding
- Admin: RBAC user management for admin role
- Dev: Docker Compose with hot reload for both frontend and backend
- Docker: 3-service orchestration (frontend, backend, postgres)

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

.env.example

@@ -0,0 +1,18 @@
+# Database
+POSTGRES_USER=evan
+POSTGRES_PASSWORD=evanpass
+POSTGRES_DB=evanpage
+DATABASE_URL=postgres://evan:evanpass@db:5432/evanpage?sslmode=disable
+
+# Backend
+SERVER_PORT=8080
+SERVER_API_URL=http://backend:8080
+
+# Auth.js / Frontend
+AUTH_SECRET=your-random-secret-min-32-chars-long
+NEXT_PUBLIC_API_URL=http://localhost:8080
+
+# Keycloak
+AUTH_KEYCLOAK_ID=evanpage-frontend
+AUTH_KEYCLOAK_SECRET=your-keycloak-client-secret
+AUTH_KEYCLOAK_ISSUER=https://keycloak.liukersun.com/realms/evan