update tech report url.

README.md

@@ -215,7 +215,7 @@ With the vocoder on the engine's GPU, at 256 streams the vocoder is fully loaded
 
 - [Fish Audio Playground](https://fish.audio)
 - [Fish Speech GitHub](https://github.com/fishaudio/fish-speech)
-- [Technical Report](https://github.com/fishaudio/fish-speech/tree/main/docs/assets/Fish_Audio_Drama_3_Technical_Report.pdf)
+- [Technical Report](https://arxiv.org/abs/2610.18010)
 - [Fish Audio Drama 3 SGLang Omni Cookbook](https://sgl-project.github.io/sglang-omni/cookbook/fishaudio_drama3.html)
 - [SGLang Omni](https://sgl-project.github.io/sglang-omni/)