更新构建配置并补充测试

src/config/config.go

@@ -197,16 +197,23 @@ func setConfig(cfg *AppConfig) {
 	configCacheMutex.Unlock()
 }
 
-// LoadConfig 加载配置文件
+func configFilePath() string {
+	if path := strings.TrimSpace(os.Getenv("CONFIG_PATH")); path != "" {
+		return path
+	}
+	return "config.toml"
+}
+
 func LoadConfig() error {
 	cfg := DefaultConfig()
+	path := configFilePath()
 
-	if data, err := os.ReadFile("config.toml"); err == nil {
+	if data, err := os.ReadFile(path); err == nil {
 		if err := toml.Unmarshal(data, cfg); err != nil {
-			return fmt.Errorf("解析配置文件失败: %v", err)
+			return fmt.Errorf("解析配置文件 %s 失败: %v", path, err)
 		}
 	} else {
-		fmt.Println("未找到config.toml，使用默认配置")
+		fmt.Printf("未找到配置文件 %s，使用默认配置\n", path)
 	}
 
 	overrideFromEnv(cfg)
@@ -259,6 +266,10 @@ func overrideFromEnv(cfg *AppConfig) {
 		cfg.Security.BlackList = append(cfg.Security.BlackList, strings.Split(val, ",")...)
 	}
 
+	if val, ok := os.LookupEnv("ACCESS_PROXY"); ok {
+		cfg.Access.Proxy = strings.TrimSpace(val)
+	}
+
 	if val := os.Getenv("MAX_IMAGES"); val != "" {
 		if maxImages, err := strconv.Atoi(val); err == nil && maxImages > 0 {
 			cfg.Download.MaxImages = maxImages

src/config/config_test.go

@@ -0,0 +1,41 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoadConfigUsesConfigPathAndEnvOverrides(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "custom.toml")
+	data := []byte(`
+[server]
+host = "127.0.0.1"
+port = 5999
+
+[access]
+proxy = "socks5://127.0.0.1:1080"
+`)
+	if err := os.WriteFile(path, data, 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	t.Setenv("CONFIG_PATH", path)
+	t.Setenv("SERVER_PORT", "6001")
+	t.Setenv("ACCESS_PROXY", "")
+
+	if err := LoadConfig(); err != nil {
+		t.Fatal(err)
+	}
+
+	cfg := GetConfig()
+	if cfg.Server.Host != "127.0.0.1" {
+		t.Fatalf("Server.Host = %q", cfg.Server.Host)
+	}
+	if cfg.Server.Port != 6001 {
+		t.Fatalf("Server.Port = %d, want 6001", cfg.Server.Port)
+	}
+	if cfg.Access.Proxy != "" {
+		t.Fatalf("Access.Proxy = %q, want empty override", cfg.Access.Proxy)
+	}
+}