Remove unused boilerplate code, consolidate to frame_parsers_gen files

[Copilot]

Consolidates frame parser implementations to the generated frame_parsers_gen.* files, removing 18 redundant boilerplate files that duplicated functionality.

Removed files

• C: basic_frame.h, basic_frame_with_len.h, struct_frame.h, struct_frame_cpp.h, struct_frame_default_frame.h, struct_frame_gen.h, struct_frame_parser.h, struct_frame_types.h
• C++: basic_frame.hpp, basic_frame_with_len.hpp, struct_frame.hpp, struct_frame_parser.hpp, struct_frame_types.hpp
• TS/JS: struct_frame_gen.*, struct_frame_parser.*
• Python: struct_frame_parser.py

Code generator updates

• C/C++ generators no longer emit includes to removed headers
• C++ namespace changed from StructFrame to FrameParsers to match frame_parsers_gen.hpp
• generate.py updated to copy only essential boilerplate files

Test updates

Updated C/C++/Python tests to use the consolidated frame parser API:

// Before
basic_frame_encode_buffer_t buffer;
basic_frame_encode_init(&buffer, encode_buffer, sizeof(encode_buffer));
basic_frame_encode_msg(&buffer, MSG_ID, &msg, MSG_SIZE);
basic_frame_msg_info_t result = basic_frame_validate_packet(buf, size);

// After
size_t encoded_size = basic_frame_encode(buf, sizeof(buf), MSG_ID, (uint8_t*)&msg, MSG_SIZE);
frame_msg_info_t result = basic_frame_validate_packet(buf, encoded_size);

# Before
from struct_frame_parser import BasicFrame
basic_frame = BasicFrame()
result = basic_frame.validate_packet(data)
if result['valid']: ...

# After  
from frame_parsers_gen import BasicFrame
result = BasicFrame.validate_packet(data)
if result.valid: ...

All tests pass (41/42 - the one failure is a pre-existing TS node types issue).

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove unused boilerplate code</issue_title>
<issue_description>Remove unused boilerplate code.
The files that should be used are

src/struct_frame/boilerplate/c/frame_parsers_gen.h
src/struct_frame/boilerplate/cpp/frame_parsers_gen.hpp
src/struct_frame/boilerplate/js/frame_parsers_gen.js
src/struct_frame/boilerplate/py/frame_parsers_gen.py
src/struct_frame/boilerplate/ts/frame_parsers_gen.ts

Ensure the tests still pass while using the new files.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove unused boilerplate code #62

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