[BACKEND] Initialize Go backend structure and dependencies (#23)

server/config/config.go

@@ -0,0 +1,36 @@
+package config
+
+import (
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+// Config holds all application configuration.
+type Config struct {
+	Port        string
+	DatabaseURL string
+	JWTSecret   string
+	Environment string
+}
+
+// Load reads configuration from environment variables.
+// A .env file is loaded if present but not required.
+func Load() *Config {
+	// Best-effort .env load (not required in production)
+	_ = godotenv.Load()
+
+	return &Config{
+		Port:        getEnv("PORT", "8080"),
+		DatabaseURL: getEnv("DATABASE_URL", ""),
+		JWTSecret:   getEnv("JWT_SECRET", "dev-secret-change-me"),
+		Environment: getEnv("ENVIRONMENT", "development"),
+	}
+}
+
+func getEnv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}