chore: vendor sglang v0.5.10 snapshot

third_party/sglang/docs/diffusion/performance/cache/index.md

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+# Caching Acceleration
+
+SGLang provides two complementary caching strategies for Diffusion Transformer (DiT) models. Both reduce denoising cost by skipping redundant computation, but they operate at different levels.
+
+## Overview
+
+SGLang supports two complementary caching approaches:
+
+| Strategy | Scope | Mechanism | Best For |
+|----------|-------|-----------|----------|
+| **Cache-DiT** | Block-level | Skip individual transformer blocks dynamically | Advanced, higher speedup |
+| **TeaCache** | Timestep-level | Skip entire denoising steps based on L1 similarity | Simple, built-in |
+
+## Cache-DiT
+
+[Cache-DiT](https://github.com/vipshop/cache-dit) provides block-level caching with
+advanced strategies like DBCache and TaylorSeer. It can achieve up to **1.69x speedup**.
+
+See [cache_dit.md](cache_dit.md) for detailed configuration.
+
+### Quick Start
+
+```bash
+SGLANG_CACHE_DIT_ENABLED=true \
+sglang generate --model-path Qwen/Qwen-Image \
+    --prompt "A beautiful sunset over the mountains"
+```
+
+### Key Features
+
+- **DBCache**: Dynamic block-level caching based on residual differences
+- **TaylorSeer**: Taylor expansion-based calibration for optimized caching
+- **SCM**: Step-level computation masking for additional speedup
+
+## TeaCache
+
+TeaCache (Temporal similarity-based caching) accelerates diffusion inference by detecting when consecutive denoising steps are similar enough to skip computation entirely.
+
+See [teacache.md](teacache.md) for detailed documentation.
+
+### Quick Overview
+
+- Tracks L1 distance between modulated inputs across timesteps
+- When accumulated distance is below threshold, reuses cached residual
+- Supports CFG with separate positive/negative caches
+
+### Supported Models
+
+- Wan (wan2.1, wan2.2)
+- Hunyuan (HunyuanVideo)
+- Z-Image
+
+For Flux and Qwen models, TeaCache is automatically disabled when CFG is enabled.
+
+```{toctree}
+:maxdepth: 1
+
+cache_dit
+teacache
+```
+
+## References
+
+- [Cache-DiT Repository](https://github.com/vipshop/cache-dit)
+- [TeaCache Paper](https://arxiv.org/abs/2411.14324)