fix: improve Windows compatibility for Makefile and sync tools

[rainoeelmae]

This PR provides full cross-platform support (Windows/macOS/Linux) for the development environment. Key Changes
Makefile: Refactored dev and stop targets using cross-env and kill-port to support PowerShell/CMD. Compatibility: Replaced Unix-specific grep/awk in the help target with a Python one-liner. Bug Fix: Added encoding='utf-8' to tools/sync_vuegraphs.py to prevent charmap decode errors on Windows systems. Dependencies: Added necessary dev-tools to package.json files to ensure a seamless "clone and run" experience.

[huatl98]

Thanks for the PR! I tested it on Windows (PowerShell/CMD) and the overall direction looks good — make dev / make stop and tools/sync_vuegraphs.py work as expected.

One issue: make help fails with:
FileNotFoundError: [Errno 2] No such file or directory: ' Makefile'

It looks like $(MAKEFILE_LIST) expands with leading whitespace. A minimal cross-platform fix is to sanitize the path before open():
@python -c "import re;
p=r'$(firstword $(MAKEFILE_LIST))'.strip();
print('\n'.join(f'{m[0]:<20} {m[1]}' for m in re.findall(r'^([a-zA-Z_-]+):.?## (.)$$', open(p, encoding='utf-8').read(), re.M)))" | sort

[rainoeelmae]

Updated Makefile.