chore: 初始开源发布

iotlcm-worker-svr：异步执行中枢（RabbitMQ 消费者 + 全量同步编排）。

- Go module：iotlcm-worker-svr → git.5iot.com/iotlcm-public/iotlcm-worker-svr（214 文件）
- 凭据与内部标识脱敏：MySQL/Redis 凭据、私网与生产 IP、内网域名、
  库名 xiujie_admin → iotlcm、哨兵名占位
- 159 处真实手机号 → 合法 11 位编造号（保留号段与后 4 位，维持互异，
  不破坏「校验 MSISDN 格式」等测试断言）
- 移除内部资产：CI 触发器、Jenkins 触发测试文档、预演门禁与镜像
  digest 记录
- Dockerfile 改用公共基础镜像（golang:1.25-alpine → alpine:3.23），
  移除写死的 git 凭据
- README 重写（架构/全量同步模型/配置/已知失败），补 Apache-2.0
  LICENSE，LF 行尾 + .gitattributes

已知：3 个测试包在源仓同一提交上同样失败（client/upstream、
service/allocate、service/inbound），属既有缺陷，本仓未引入亦未修复。

internal/consumer/rabbitmq/batch_test.go

@@ -0,0 +1,48 @@
+package rabbitmq
+
+import "testing"
+
+func TestShouldDeadLetterBatch(t *testing.T) {
+	tests := []struct {
+		name       string
+		retryCount int
+		maxRetries int
+		want       bool
+	}{
+		{name: "first attempt retries", retryCount: 0, maxRetries: 3, want: false},
+		{name: "second attempt retries", retryCount: 1, maxRetries: 3, want: false},
+		{name: "last configured retry retries", retryCount: 2, maxRetries: 3, want: false},
+		{name: "next failure dead letters", retryCount: 3, maxRetries: 3, want: true},
+		{name: "zero retries dead letters immediately", retryCount: 0, maxRetries: 0, want: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if actual := shouldDeadLetterBatch(tt.retryCount, tt.maxRetries); actual != tt.want {
+				t.Fatalf("shouldDeadLetterBatch(%d, %d) = %t, want %t", tt.retryCount, tt.maxRetries, actual, tt.want)
+			}
+		})
+	}
+}
+
+func TestBatchRetryCount(t *testing.T) {
+	tests := []struct {
+		name    string
+		headers map[string]any
+		want    int
+	}{
+		{name: "missing", want: 0},
+		{name: "int", headers: map[string]any{batchRetryCountHeader: 2}, want: 2},
+		{name: "int64", headers: map[string]any{batchRetryCountHeader: int64(3)}, want: 3},
+		{name: "uint", headers: map[string]any{batchRetryCountHeader: uint16(4)}, want: 4},
+		{name: "string", headers: map[string]any{batchRetryCountHeader: "5"}, want: 5},
+		{name: "negative", headers: map[string]any{batchRetryCountHeader: -1}, want: 0},
+		{name: "invalid", headers: map[string]any{batchRetryCountHeader: "not-a-number"}, want: 0},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if actual := batchRetryCount(tt.headers); actual != tt.want {
+				t.Fatalf("batchRetryCount() = %d, want %d", actual, tt.want)
+			}
+		})
+	}
+}