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/config.go

@@ -0,0 +1,26 @@
+package config
+
+import (
+	"os"
+)
+
+type Config struct {
+	ServerPort  string
+	DatabaseURL string
+	APIToken    string
+}
+
+func Load() *Config {
+	return &Config{
+		ServerPort:  getEnv("SERVER_PORT", "8080"),
+		DatabaseURL: getEnv("DATABASE_URL", "postgres://postgres:postgres@localhost:5432/material_db?sslmode=disable"),
+		APIToken:    getEnv("API_TOKEN", "seatons3d"),
+	}
+}
+
+func getEnv(key, defaultValue string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return defaultValue
+}