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>

internal/config/database.go

@@ -0,0 +1,33 @@
+package config
+
+import (
+	"log"
+	"time"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func NewDatabase(cfg *Config) *gorm.DB {
+	db, err := gorm.Open(postgres.Open(cfg.DatabaseURL), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Info),
+	})
+	if err != nil {
+		log.Fatalf("Failed to connect to database: %v", err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		log.Fatalf("Failed to get database instance: %v", err)
+	}
+
+	// 连接池配置 (优化: 支持更高并发)
+	sqlDB.SetMaxIdleConns(50)                   // 空闲连接数 (原 10)
+	sqlDB.SetMaxOpenConns(200)                  // 最大连接数 (原 100)
+	sqlDB.SetConnMaxLifetime(5 * time.Minute)   // 连接最大生命周期
+	sqlDB.SetConnMaxIdleTime(2 * time.Minute)   // 空闲连接最大生命周期
+
+	log.Println("Database connected successfully")
+	return db
+}