Fix packaging: include did.implementations subpackage

[audriB]

Summary

• pip install (non-editable) omits the did.implementations subpackage because pyproject.toml hardcodes packages = ["did"]
• This causes ModuleNotFoundError: No module named 'did.implementations' when importing did.implementations.sqlitedb
• The bug is masked in CI because pip install -e . (editable mode) exposes the full source tree via a .pth file

Root cause

PR #12 refactored from setup.py (which used find_packages() — auto-discovers all subpackages) to pyproject.toml with a hardcoded package list that only includes ["did"], missing did.implementations.

Fix

Replace the hardcoded list with setuptools auto-discovery:

# Before (broken):
[tool.setuptools]
packages = ["did"]

# After (fixed):
[tool.setuptools.packages.find]
where = ["src"]

This matches the original setup.py behavior and will automatically include any future subpackages.

Verification

Tested with a clean non-editable install:

$ pip install .  # (not -e)
$ python -c "from did.implementations.sqlitedb import SQLiteDB; print('OK')"
OK

Before the fix, this produces ModuleNotFoundError.

Note

The MATLAB version (DID-matlab) doesn't have this issue because genpath() recursively adds all subdirectories. This fix brings the Python packaging in line with that behavior.

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