bugfix: fix DeepSeek V3 crash and V3.2 prefix-cache OOM.

[DongheJin]

No description provided.

[gemini-code-assist]

Code Review

This pull request updates the xllm_atb_layers subproject and modifies the NPU format allocation logic in worker_impl.cpp to include the deepseek_v3_mtp model type. A review comment identifies a critical correctness issue where a corresponding update is needed in llm_engine.cpp to prevent shape mismatches. Additionally, the use of auto for a string type violates the repository style guide, and the associated comment requires updating for accuracy.

[gemini-code-assist]

This change introduces a critical correctness issue and a style violation:

1. Correctness (Critical): By adding deepseek_v3_mtp to the FRACTAL_NZ format logic here without updating the corresponding capacity estimation logic in llm_engine.cpp (line 456), you create a mismatch between the allocated tensor shape and the NPU format. This will likely lead to a shape mismatch error or crash during npu_format_cast. You must update llm_engine.cpp to include deepseek_v3_mtp in its format check as well.
2. Style (High): Per Rule 89 of the Repository Style Guide, auto should not be used for std::string.
3. Documentation: The comment on lines 291-292 is now inaccurate as it claims only deepseek_v3 uses this format.

Suggested change

	// Keep runtime allocation format consistent with capacity estimation in
	// llm_engine: only deepseek_v3 uses FRACTAL_NZ with prefix cache.
	const auto& model_type = context_.get_model_args().model_type();
	aclFormat npu_format_type =
	context_.get_model_args().model_type() == "deepseek_v3" &&
	FLAGS_enable_prefix_cache
	((model_type == "deepseek_v3" || model_type == "deepseek_v3_mtp") &&
	FLAGS_enable_prefix_cache)
	? ACL_FORMAT_FRACTAL_NZ
	: ACL_FORMAT_ND;
	// Keep runtime allocation format consistent with capacity estimation in
	// llm_engine: deepseek_v3 and deepseek_v3_mtp use FRACTAL_NZ with prefix cache.
	const std::string& model_type = context_.get_model_args().model_type();
	aclFormat npu_format_type =
	((model_type == "deepseek_v3" || model_type == "deepseek_v3_mtp") &&
	FLAGS_enable_prefix_cache)
	? ACL_FORMAT_FRACTAL_NZ
	: ACL_FORMAT_ND;

References

1. Rule 89: Do not use auto for simple/primitive types (including std::string). ^(link)