Fix pip install -e for daqp-python when run from outside the package directory

[Copilot]

setup.py used os.environ["PWD"] to locate the daqp source tree, assuming the user was in the daqp-python directory. Running pip install -e from any other directory produced incorrect paths and a broken install.

Changes

• interfaces/daqp-python/setup.py: Replace os.environ["PWD"]-based path resolution with pathlib.Path(__file__).parent.resolve(), making all paths relative to setup.py itself rather than the caller's working directory.
  • src_path now resolves to the repo root via setup_dir / "../.." instead of PWD + "../../../daqp"
  • csrc_dir, source files, include dirs, README.md, and LICENSE all use absolute paths derived from setup_dir
  • Fixed misleading "Could not find daqp directory" message that also fired when csrc_dir already existed

# Before — breaks if not run from interfaces/daqp-python/
src_path = pathlib.Path(os.environ["PWD"], "../../../daqp")
csrc_dir = pathlib.Path('./csrc')

# After — works from any directory
setup_dir = pathlib.Path(__file__).parent.resolve()
src_path = (setup_dir / "../..").resolve()
csrc_dir = setup_dir / 'csrc'

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