第 0 阶段：项目初始化

backend/internal/config/config.go

@@ -0,0 +1,58 @@
+package config
+
+import (
+	"os"
+	"strconv"
+)
+
+type Config struct {
+	AppEnv        string
+	AppAddr       string
+	MySQLDSN      string
+	RedisAddr     string
+	RedisPassword string
+	RedisDB       int
+	JWTSecret     string
+	Storage       StorageConfig
+}
+
+type StorageConfig struct {
+	Endpoint string
+	Bucket   string
+}
+
+func Load() Config {
+	return Config{
+		AppEnv:        getEnv("APP_ENV", "development"),
+		AppAddr:       getEnv("APP_ADDR", ":8080"),
+		MySQLDSN:      getEnv("MYSQL_DSN", "hfb:secret@tcp(127.0.0.1:3306)/hfb_sys?charset=utf8mb4&parseTime=True&loc=Local"),
+		RedisAddr:     getEnv("REDIS_ADDR", "127.0.0.1:6379"),
+		RedisPassword: getEnv("REDIS_PASSWORD", ""),
+		RedisDB:       getEnvInt("REDIS_DB", 0),
+		JWTSecret:     getEnv("JWT_SECRET", "change-me"),
+		Storage: StorageConfig{
+			Endpoint: getEnv("STORAGE_ENDPOINT", "http://127.0.0.1:9000"),
+			Bucket:   getEnv("STORAGE_BUCKET", "hfb-sys"),
+		},
+	}
+}
+
+func getEnv(key, fallback string) string {
+	value := os.Getenv(key)
+	if value == "" {
+		return fallback
+	}
+	return value
+}
+
+func getEnvInt(key string, fallback int) int {
+	value := os.Getenv(key)
+	if value == "" {
+		return fallback
+	}
+	parsed, err := strconv.Atoi(value)
+	if err != nil {
+		return fallback
+	}
+	return parsed
+}