net load api wchar_t version

[nihui]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.98%. Comparing base (6bc338e) to head (ad9303a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6491      +/-   ##
==========================================
- Coverage   93.40%   92.98%   -0.42%     
==========================================
  Files         845      845              
  Lines      264353   264650     +297     
==========================================
- Hits       246911   246079     -832     
- Misses      17442    18571    +1129     

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[Copilot]

Pull request overview

This PR adds wchar_t (wide character) versions of the net load API functions for Windows to support file paths with non-ASCII characters. It also includes minor test updates to copy additional layer support flags.

• Adds load_param(const wchar_t*), load_param_bin(const wchar_t*), and load_model(const wchar_t*) methods for Windows in the Net class
• Exposes these new methods through the C API with _w suffixes
• Updates Python bindings to use std::wstring on Windows
• Updates test code to copy support_any_packing and support_vulkan_any_packing flags

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/net.h	Declares wchar_t overloads for load_param, load_param_bin, and load_model methods on Windows
src/net.cpp	Implements wchar_t overloads using _wfopen for Windows file access
src/c_api.h	Declares C API functions with _w suffix for wchar_t support on Windows
src/c_api.cpp	Implements C API wrappers that call the C++ wchar_t methods
python/src/main.cpp	Updates Python bindings to accept std::wstring paths on Windows
tests/test_squeezenet.cpp	Copies support_any_packing and support_vulkan_any_packing flags in test layer wrapper
docs/how-to-use-and-FAQ/ncnn-load-model.md	Documents the new wchar_t API variants in the load model reference table

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