feat(ncm §24): 流媒体客户端边下边播阶段3——.part断点续传(Range/206/200/416)+LRU防淘汰(.tmp/.part跳过)+失败重试1次退避

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按 devdocs/plan/NCM_STREAM_PLAY.md §8 阶段3：
- .part 断续传：中断留 .part，续传带 Range，206 追加 / 200 丢头段 / 416 删残留整首重下；URL 每次新拉
- LRU 防淘汰：evict/total_bytes 跳过 .tmp/.part（在播文件不被动过）
- 失败重试：预缓冲前网络失败重试 1 次，退避 800ms，重试拿新签名 URL（风控：0 真实请求，未部署）
- 顺手修：gb_to_bytes 返回 int 溢出致默认 10GB 上限失效 -> uint64_t
- 验证：stream_sim(续传 PCM 金标准+全矩阵)/player_flow_sim(P9/P10/P11)/cache_evict_sim(case7/8)/test_ncm_core 宿主+qemu-mipsel 全 PASS；build_ncm.sh 0 warning；ncm_host 离屏正常

md5 ncm f8f316a1e6f3bdd8f6b5921fdbb3f3a2

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MeowOS committed 2026-09-01 20:00:14 +08:00

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