feat(framelib): add online v2 frame definitions and frame generation

[AEGO-WRJ]

Summary

This PR adds online-core v2 support in framelib, including frame definitions, frame generation, and corresponding tests.

Changes

• add online v2 frame definitions in paicorelib/framelib/frame_defs.py
• add online v2 frame generation in paicorelib/framelib/frame_gen_v2.py
• add online v2 test coverage in tests/framelib/test_frame_gen_v2.py
• keep existing legacy/offline code paths unchanged
• keep tests/framelib/test_base.py unchanged

Notes

• implementation follows the existing v2/offline style as closely as possible
• endian handling and bit-field packing were aligned with the online v2 frame definitions
• only incremental updates were made for v2 support; old version behavior was not modified

Validation

• online v2 tests in tests/framelib/test_frame_gen_v2.py passed

[codecov]

Codecov Report

❌ Patch coverage is 95.43039% with 43 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
paicorelib/framelib/frame_gen_v2.py	84.69%	26 Missing and 17 partials ⚠️

Files with missing lines	Coverage Δ
paicorelib/__init__.py	91.30% <100.00%> (ø)
paicorelib/core_defs_v2.py	100.00% <100.00%> (ø)
paicorelib/core_model_v2.py	100.00% <100.00%> (ø)
paicorelib/framelib/frame_defs.py	100.00% <100.00%> (ø)
paicorelib/neuron_defs_v2.py	100.00% <100.00%> (ø)
paicorelib/neuron_model_v2.py	100.00% <100.00%> (ø)
tests/framelib/test_frame_gen_v2.py	100.00% <100.00%> (ø)
paicorelib/framelib/frame_gen_v2.py	91.16% <84.69%> (-6.97%)	⬇️