fix(ttstream): ttstream should not recycle connection when Recv Timeout with DisableCancelRemote=true

[DMwangnima]

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fix

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1. Bug 触发场景
   客户端使用 TTStream 进行流式 RPC 调用，配置 RecvTimeout + DisableCancelRemote=true 时触发。

2. 触发原因
   当 Recv 超时触发后，ctxDoneCallback 会被触发，执行 s.close 关闭 Stream，并复用 Stream 对应的连接。

但当 DisableCancelRemote=true 时，这个 Stream 的生命周期不应该结束，直接复用会导致一个连接上出现两个 Stream 的数据，违背了一个连接一个 Stream 的原则。

4. 主要变更

• 重构 Pipe：构造时绑定 stream ctx 和 callback，用于控制感知整个 stream 的生命周期变化；新增 ReadCtx(perReadCtx, perReadCallback, items) 方法，在 waitCtx 中通过独立的 select 分支分别监听 stream ctx 和 per-read ctx，彻底分离两种超时来源。
• 解耦 per-read timeout context：RecvMsg 中单次 Recv 超时改为 context.WithTimeout(context.Background(), recvTimeout)，不再派生自 stream ctx，避免超时来源混淆。
• 拆分 callback：新增 recvTimeoutCallback 专门处理 Recv 超时；原 ctxDoneCallback 仅处理流级别 cancel/timeout，使用新增的 newStreamTimeoutException 返回准确的流超时错误。
• 新增 Stream 超时异常：错误码 12015，错误描述 stream timeout, timeout in ctx: %+v
• CtxDoneCallback 签名改为返回 error，使 callback 中的具体错误能直接传播给调用方。
• container 部分全部移动至 ttstream/internal/container 下
• 修改 streaming 接口注释，明确 Recv/Send 报错后不应再次调用；即使再次调用后也会返回相同的错误

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[codecov]

Codecov Report

❌ Patch coverage is 93.27731% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.94%. Comparing base (bfa27f3) to head (3696079).
⚠️ Report is 34 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/remote/trans/ttstream/client_handler.go	50.00%	1 Missing and 1 partial ⚠️
...g/remote/trans/ttstream/internal/container/pipe.go	96.49%	1 Missing and 1 partial ⚠️
pkg/remote/trans/ttstream/stream_client.go	91.30%	1 Missing and 1 partial ⚠️
pkg/remote/trans/ttstream/stream_reader.go	85.71%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1934      +/-   ##
==========================================
+ Coverage   61.37%   61.94%   +0.56%     
==========================================
  Files         388      391       +3     
  Lines       35063    30182    -4881     
==========================================
- Hits        21521    18695    -2826     
+ Misses      12247    10202    -2045     
+ Partials     1295     1285      -10     

Flag	Coverage Δ
integration	52.01% <86.55%> (+1.51%)	⬆️
unit	52.19% <89.91%> (+0.54%)	⬆️

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