[KVCache] Storage cache supports c8 model

[juncaipeng]

Motivation

全局cache池化支持c8模型

Modifications

Cache读写模块

Usage or Command

xxx

Accuracy Tests

xxx

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
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• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
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[paddle-bot]

Thanks for your contribution!

[Copilot]

Pull request overview

此 PR 为存储缓存添加了对 c8 模型的支持，主要是通过实现 block_wise_fp8 量化缓存的 scale 数据的读写功能。

Changes:

• 扩展 mooncake_store 的 query 方法以支持可选的 scale keys 参数
• 在 CacheTransferManager 中添加 cache scale 支持，包括 scale buffer 的初始化和管理
• 更新 CUDA kernel 中的 cache_block_stride 计算以支持不同维度的缓存布局

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 8 comments.

File	Description
fastdeploy/cache_manager/transfer_factory/mooncake_store/mooncake_store.py	添加 k_scale_keys 和 v_scale_keys 参数到 query 方法，支持检查 scale 数据的存在性
fastdeploy/cache_manager/cache_transfer_manager.py	实现 block_wise_fp8 的完整支持，包括 scale buffer 初始化、读写操作中的 scale 数据处理
custom_ops/gpu_ops/swap_cache_layout.cu	重构 cache_block_stride 计算以支持不同形状的缓存布局（包括 scale 布局）

[codecov-commenter]

Codecov Report

❌ Patch coverage is 8.18182% with 101 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@39dc4b0). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
fastdeploy/cache_manager/cache_transfer_manager.py	8.42%	84 Missing and 3 partials ⚠️
.../transfer_factory/mooncake_store/mooncake_store.py	6.66%	14 Missing ⚠️

Additional details and impacted files

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  Hits               ?    34513           
  Misses             ?    14508           
  Partials           ?     2472           

Flag	Coverage Δ
GPU	67.02% <8.18%> (?)

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 11 comments.

[EmmonsCurse]

LGTM～后续辛苦补充 cache_transfer_manager.py 相关单测～