Prepare to release Apache RocketMQ 5.5.1

### Motivation

Prepare to release Apache RocketMQ 5.5.1.

### Prerequisites / Blockers

None. The dLedger fastjson1 dependency has been removed (bumped to 0.3.3.4).

### Summary

- **Security & dependencies**: Removed fastjson 1.x from the distribution (fastjson2 upgraded to 2.0.63), bumped DLedger to 0.3.3.4, and deprecated the legacy Broker DLedger mode.
- **Native RocksDB CqCompactionFilter**: Introduced a cross-platform JNI shim, replacing the shaded rocketmq-rocksdb dependency with the official rocksdbjni.
- **Stability & correctness**: Fixed 30+ bugs including pop consumer CK record loss, TLS certificate hot-reload native memory leak, tiered storage concurrency issues, ServiceThread data race, master election comparator overflow, and CombineConsumeQueue long-polling notification miss.
- **Lite messaging evolution**: Server-side Lite Simple Consumer support, exclusive subscription eviction via tombstones, lite topic reset offset fix, and removal of the legacy enableLiteEventMode switch.
- **Performance**: Reduced per-message and per-RPC allocations (MessageId, Remoting header encoding, metrics AttributeKey, CommitLog scratch buffer), added madvise(MADV_RANDOM) for offset binary search, and introduced dispatch memory backpressure.

### 变更摘要

- **安全与依赖**：发行物中移除 fastjson 1.x（fastjson2 升级至 2.0.63），DLedger 升级至 0.3.3.4，废弃 legacy Broker DLedger 模式。
- **原生 RocksDB CqCompactionFilter**：引入跨平台 JNI shim，以官方 rocksdbjni 替换 shaded rocketmq-rocksdb 依赖。
- **稳定性与正确性**：修复 30+ 个 Bug，包括 Pop 消费 CK 记录丢失、TLS 证书热加载 native 内存泄漏、分级存储并发问题、ServiceThread 数据竞争、Master 选举比较器溢出、CombineConsumeQueue 长轮询通知丢失等。
- **Lite 消息演进**：服务端支持 Lite Simple Consumer、基于墓碑机制的独占订阅驱逐、Lite Topic 重置 offset 修复、移除遗留 enableLiteEventMode 开关。
- **性能优化**：减少单消息和单 RPC 内存分配（MessageId、Remoting 头编码、Metrics AttributeKey、CommitLog 线程缓冲），offset 二分查找引入 madvise(MADV_RANDOM)，新增 dispatch 内存反压。

### Release Status

- Release PR: #10961 (merged)
- Tag: `rocketmq-all-5.5.1` (`efa1be59d6fc747ad220f036c86030f05f0419f9`)
- RC1 artifacts: [5.5.1-rc1](https://dist.apache.org/repos/dist/dev/rocketmq/5.5.1-rc1/)
- Staging repo: [orgapacherocketmq-1377](https://repository.apache.org/content/repositories/orgapacherocketmq-1377/)
- Release Notes PR: https://github.com/apache/rocketmq-site/pull/793

Full changelog:
[rocketmq-all-5.5.0...rocketmq-all-5.5.1](https://github.com/apache/rocketmq/compare/rocketmq-all-5.5.0...rocketmq-all-5.5.1)

Start by reviewing the merged release PR #10961, tag rocketmq-all-5.5.1, RC1 artifacts, and staging repository orgapacherocketmq-1377. The release preparation is complete when the release artifacts, tag, and release notes are verified.

Written by the indexing model from the issue text.