Deepseek V4 integration fixed

This release is mainly to fix the Deepseek V4 integration!!!

<img width="714" height="774" alt="image" src="https://github.com/user-attachments/assets/0d85e891-a0ff-436e-a9d4-b6633096f2b5" />

• [fix] Add fatal_error to ContinuousBatchingManager so the serving... by @qgallouedec, @remi-or
• Fix WeightConverter regex incorrectly matching shared_experts as experts by @silencelamb, @claude
• Fix deepseek v4 by @ArthurZucker (#45892)
• Deepseek v4 csa mask collapse by @ArthurZucker, @Sawyer117 (#45928)