feat(framework): 回灌 OpenFlare 分层、安全与运行时改进

将平台域持久化收敛为 repository 唯一入口，model 去掉 IO。
邮件头写入前清除 CR/LF，防止 header 注入。
httppool 支持可配置 Transport；batchwriter 增加 MinBatchSize/Stats，flush 失败交回批次；任务 PermanentError 作为 SkipRetry 终态。
设置与推送页的确认改为 AlertDialog；axios 去尾斜杠并按 Gin 数组序列化查询参数。
升级共享 Go 依赖（Gin、Asynq、OTel、GORM、Redis 等）。

pkg/httppool/httppool_test.go

@@ -4,6 +4,12 @@
 package httppool
 
 import (
+	"context"
+	"crypto/tls"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
 	"testing"
 	"time"
 )
@@ -35,3 +41,60 @@ func TestNewClient(t *testing.T) {
 		t.Error("NewClient() is not configured with the default transport")
 	}
 }
+
+func TestNewTransportUsesConfiguredDirectDialer(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, _ *http.Request) {
+		_, _ = writer.Write([]byte("ok"))
+	}))
+	t.Cleanup(server.Close)
+
+	var dialedAddress string
+	dialer := &net.Dialer{}
+	transport := NewTransport(TransportOptions{
+		Proxy: nil,
+		DialContext: func(ctx context.Context, network string, address string) (net.Conn, error) {
+			dialedAddress = address
+			return dialer.DialContext(ctx, network, server.Listener.Addr().String())
+		},
+	})
+	client := &http.Client{Transport: transport}
+	t.Cleanup(client.CloseIdleConnections)
+
+	request, err := http.NewRequestWithContext(t.Context(), http.MethodGet, "http://artifact.example/site.zip", nil)
+	if err != nil {
+		t.Fatalf("NewRequestWithContext() error = %v", err)
+	}
+	response, err := client.Do(request)
+	if err != nil {
+		t.Fatalf("client.Do() error = %v", err)
+	}
+	defer func() { _ = response.Body.Close() }()
+	if _, err := io.ReadAll(response.Body); err != nil {
+		t.Fatalf("ReadAll() error = %v", err)
+	}
+	if dialedAddress != "artifact.example:80" {
+		t.Fatalf("DialContext address = %q, want direct target", dialedAddress)
+	}
+}
+
+func TestNewTransportClonesTLSConfig(t *testing.T) {
+	server := httptest.NewTLSServer(http.HandlerFunc(func(writer http.ResponseWriter, _ *http.Request) {
+		writer.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
+
+	tlsConfig := &tls.Config{InsecureSkipVerify: true} //nolint:gosec // test-only self-signed server
+	client := &http.Client{Transport: NewTransport(TransportOptions{TLSClientConfig: tlsConfig})}
+	t.Cleanup(client.CloseIdleConnections)
+	tlsConfig.InsecureSkipVerify = false
+
+	request, err := http.NewRequestWithContext(t.Context(), http.MethodGet, server.URL, nil)
+	if err != nil {
+		t.Fatalf("NewRequestWithContext() error = %v", err)
+	}
+	response, err := client.Do(request)
+	if err != nil {
+		t.Fatalf("client.Do() error = %v", err)
+	}
+	_ = response.Body.Close()
+}