Initial commit: Material Texture API service

- Go + Gin + GORM + PostgreSQL backend
- RESTful API for material management
- Docker deployment support
- Database partitioning for billion-scale data
- API documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,44 @@
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      - "8081:8080"
+    environment:
+      - SERVER_PORT=8080
+      - DATABASE_URL=postgres://postgres:postgres@db:5432/material_db?sslmode=disable
+      - API_TOKEN=${API_TOKEN:-seatons3d}
+    depends_on:
+      db:
+        condition: service_healthy
+    restart: unless-stopped
+    networks:
+      - material-network
+
+  db:
+    image: postgres:15-alpine
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+      - POSTGRES_DB=material_db
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./migrations:/docker-entrypoint-initdb.d:ro
+    ports:
+      - "5433:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped
+    networks:
+      - material-network
+
+volumes:
+  postgres_data:
+
+networks:
+  material-network:
+    driver: bridge