Remove C128 req slot allocation reset

[zhangxiaolei123456]

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CI States

Latest PR Test (Base): ❌ Run #28293208004
Latest PR Test (Extra): ❌ Run #28293207904

[gemini-code-assist]

Code Review

The pull request removes the _clear_c128_req_state_for_new_slots helper function and its usage from alloc_req_slots in common.py. In deepseek_v4_memory_pool.py, the batch clearing method clear_c128_req_states is removed, and the single-slot clearing method clear_c128_req_state is simplified to perform direct in-place tensor operations. Additionally, the associated unit test file has been deleted. I have no feedback to provide.

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