Refactor: follow pypto-lib's flattened model directories

[zhangqi-chen]

pypto-lib replaced models/// with one flat directory per
model build, so the hardcoded kernel paths here no longer resolve.

• Bump the pypto-lib submodule to the revision that carries the rename.
• Qwen3-14B resolves models/qwen3_14b instead of models/qwen3/14b, in both
  the PYPTO_ROOT branch and the checkout walk.
• DeepSeekV4 resolves models/deepseek_v4_flash_mtp instead of
  models/deepseek/v4-flash. Two places assumed the extra family level:
  _is_deepseek_v4_module_file compared three trailing path segments, and
  _load_kernel_modules derived the pypto-lib root it puts on sys.path as
  _kernel_dir.parents[2]. Both now count one level less.
• Retarget the kernel-directory constants in the tests.

[coderabbitai]

📝 Walkthrough

Walkthrough

DeepSeekV4 and Qwen3-14B kernel discovery now targets flattened model directories. Module detection and related test fixtures use the same paths.

Changes

Kernel path migration

Layer / File(s)	Summary
Update discovery paths and test fixtures pypto_serving/model/deepseek/npu_executor.py, pypto_serving/model/qwen/npu_executor.py, tests/test_*.py	DeepSeekV4 uses models/deepseek_v4_flash_mtp. Qwen3-14B uses models/qwen3_14b. DeepSeekV4 module detection and related test fixtures match the flattened paths.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• hw-native-sys/pypto-serving#135: Updates kernel directory paths in the same executor files and related tests.
• hw-native-sys/pypto-serving#108: Modifies DeepSeekV4 kernel discovery and module detection.
• hw-native-sys/pypto-serving#93: Modifies DeepSeekV4 kernel discovery and its test fixture.

Poem

A rabbit hops through paths anew,
DeepSeek finds its kernels true.
Qwen’s directory lies flat and neat,
Tests follow with nimble feet.
“No nested burrows!” says the hare.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: adapting kernel paths to flattened pypto-lib model directories.
Description check	✅ Passed	The description directly explains the flattened-directory migration, code changes, dependency update, and test path updates.

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