fix(bundle): include shell lazy imports in PyInstaller build

[F16shen]

Summary

This PR fixes a release-blocking bundle startup regression introduced in the 0.2.1 release path.

During Release Preparation validation, the installed Linux bundle failed to start aish after installation with:

Import error: No module named 'aish.shell.entry'
This binary may not be built correctly.

Root Cause

aish.shell exposes shell entry points through lazy package exports in src/aish/shell/__init__.py.
The standalone binary is built with PyInstaller, but the spec only listed aish.shell as a hidden import and did not explicitly collect the lazily imported aish.shell.* submodules.

That meant the bundle could successfully build, but the installed aish binary failed at runtime once the CLI tried to import run_shell through the lazy export path.

Changes

Fixed

• Updated aish.spec to collect aish.shell submodules with collect_submodules('aish.shell') so lazy shell imports are bundled into the standalone binary.
• Added a packaging regression test to guard the PyInstaller spec configuration for lazy shell imports.
• Updated the 0.2.1 changelog entry to describe the actual standalone bundle startup fix.

Validation

Automated

• /home/lixin/workspace/aishell/aish/.venv/bin/python -m pytest tests/scripts/packaging/test_update_release_files.py tests/scripts/packaging/test_release_metadata.py tests/scripts/packaging/test_pyinstaller_spec.py -q
• make test
• Result: 569 passed, 15 skipped

Manual release-path verification

• Rebuilt standalone binaries with make build-binary
• Verified ./dist/aish run --model openai/gpt-4o-mini --api-key dummy can start the interactive shell in a PTY and exit cleanly
• Rebuilt release bundle staging via make build-bundle far enough to install artifacts into build/bundle/aish-0.2.1-linux-x86_64/rootfs
• Verified the staged installed binary build/bundle/aish-0.2.1-linux-x86_64/rootfs/usr/bin/aish run --model openai/gpt-4o-mini --api-key dummy can also enter the interactive shell and exit cleanly

Files

• aish.spec
• tests/scripts/packaging/test_pyinstaller_spec.py
• CHANGELOG.md

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Contribution guide: https://github.com/AI-Shell-Team/aish/blob/main/CONTRIBUTING.md

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