bypos-collector: 移除硬编码 sdogid、添加重试、补全 CSV 导出、增加测试

改进内容:
- sdogid 不再硬编码，优先从 $BYPOS_SDOGID 环境变量读取，其次 -sdogid 参数，
  也可在 Web 控制台输入框填写；三者都未设时启动警告、采集报错
- 网络错误自动重试（最多 3 次，指数退避 500ms/1s/2s）
- Web 控制台采集参数区增加 sdogid 输入框
- CSV 导出补全 retmsg 和 source 两列
- 新增 Go 单元测试（ean13Check、md5hex、sanitizeBarcodes、resolveSdogID 等）
- README 更新配置说明

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

tools/bypos-collector/collect_test.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"os"
+	"testing"
+)
+
+func TestEan13Check_valid(t *testing.T) {
+	tests := []struct {
+		body string
+		want string
+	}{
+		{"692045990501", "6920459905012"},
+		{"690100000000", "6901000000004"},
+		{"690100000099", "6901000000998"},
+	}
+	for _, tt := range tests {
+		got, ok := ean13Check(tt.body)
+		if !ok {
+			t.Errorf("ean13Check(%q) returned not ok", tt.body)
+			continue
+		}
+		if got != tt.want {
+			t.Errorf("ean13Check(%q) = %q, want %q", tt.body, got, tt.want)
+		}
+	}
+}
+
+func TestEan13Check_invalid(t *testing.T) {
+	cases := []string{"", "12345", "12345678901", "1234567890123", "69010000a000"}
+	for _, body := range cases {
+		_, ok := ean13Check(body)
+		if ok {
+			t.Errorf("ean13Check(%q) should return not ok", body)
+		}
+	}
+}
+
+func TestMd5hex(t *testing.T) {
+	got := md5hex("137966")
+	if len(got) != 32 {
+		t.Errorf("md5hex should return 32-char hex, got len=%d", len(got))
+	}
+	if got != md5hex("137966") {
+		t.Error("md5hex should be deterministic")
+	}
+	if got == md5hex("other") {
+		t.Error("md5hex should differ for different inputs")
+	}
+}
+
+func TestSanitizeBarcodes(t *testing.T) {
+	got := sanitizeBarcodes("6920459905012\n6901028941068  123")
+	want := []string{"6920459905012", "6901028941068", "123"}
+	if len(got) != len(want) {
+		t.Fatalf("len = %d, want %d", len(got), len(want))
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Errorf("got[%d] = %q, want %q", i, got[i], want[i])
+		}
+	}
+}
+
+func TestSanitizeBarcodes_empty(t *testing.T) {
+	got := sanitizeBarcodes("  \n\t ")
+	if len(got) != 0 {
+		t.Errorf("expected empty, got %v", got)
+	}
+}
+
+func TestResolveSdogID_envOverride(t *testing.T) {
+	os.Setenv("BYPOS_SDOGID", "999999")
+	defer os.Unsetenv("BYPOS_SDOGID")
+	got := resolveSdogID("111111")
+	if got != "999999" {
+		t.Errorf("expected env var override, got %q", got)
+	}
+}
+
+func TestResolveSdogID_fallback(t *testing.T) {
+	os.Unsetenv("BYPOS_SDOGID")
+	got := resolveSdogID("111111")
+	if got != "111111" {
+		t.Errorf("expected fallback to explicit, got %q", got)
+	}
+}
+
+func TestResolveSdogID_empty(t *testing.T) {
+	os.Unsetenv("BYPOS_SDOGID")
+	got := resolveSdogID("")
+	if got != "" {
+		t.Errorf("expected empty, got %q", got)
+	}
+}
+
+func TestNewCollector_sdogFromEnv(t *testing.T) {
+	os.Setenv("BYPOS_SDOGID", "888888")
+	defer os.Unsetenv("BYPOS_SDOGID")
+	c := NewCollector("")
+	if c.sdogID != "888888" {
+		t.Errorf("expected sdogID from env, got %q", c.sdogID)
+	}
+}
+
+func TestStartRejectsEmptySdogID(t *testing.T) {
+	os.Unsetenv("BYPOS_SDOGID")
+	c := NewCollector("")
+	err := c.Start(JobReq{Mode: "list", List: "6920459905012"})
+	if err == nil {
+		t.Fatal("expected error for empty sdogid")
+	}
+}