Use onedir PyInstaller bundles for faster macOS launch

[Collinw24]

Summary

This changes the macOS PyInstaller bundle from onefile to onedir.

The current onefile app has a large amount of work before pyfa itself starts. On macOS that makes the packaged app look like it is hanging for a long time before any window appears. With onedir, the bundled files live inside the app bundle instead of being unpacked into a temp directory on every launch.

This keeps the output as pyfa.app and does not change pyfa startup/runtime code.

The packaging script now uses zip -y so macOS bundle symlinks are stored as symlinks in the release archive instead of being followed and duplicated.

Refs #1605.

Measurements

Measured on:

• Apple M3 Max
• macOS 26.3.1
• Python 3.11.9
• PyInstaller 6.2.0, matching scripts/osx-setup.sh
• local package builds from scripts/osx-package.sh

Build	Package format	First window
upstream/master at a46ad2b81	onefile app bundle	no window within the 60s timeout in 3/3 measured runs
this branch	onedir app bundle	1.54s / 1.59s / 1.68s, median 1.59s

I also used a temporary instrumented build to split out the pre-Python time. That instrumentation is not included in this PR. With the onedir bundle, the median timing was:

• first pyfa bytecode: 0.158s
• MainFrame.Show(): 1.48s
• first idle: 1.66s

Tradeoff

The installed app bundle is larger and contains more files, but preserving symlinks in the zip keeps the release archive close to the current onefile size:

Build	App bundle	Zip	Bundle contents
onefile baseline	~80M	~81M	4 files
onedir	~251M	~96M	5,062 files + 94 symlinks

QA

• python scripts/compile_lang.py
• python db_update.py
• PYFA_VERSION=qa-pyi62-onedir-symlinkzip bash scripts/osx-package.sh using PyInstaller 6.2.0
• extracted the script-built zip with /usr/bin/unzip and verified it preserved 94 symlinks
• codesign --verify --deep --strict --verbose=2 on the extracted app
• extracted-app launch check with a 5s settle between relaunches: 1.64s / 1.65s / 1.65s / 1.71s / 1.99s, median 1.65s
• git diff --check

Local pytest note: I did not treat pytest as the validation path for this packaging-only change. In this checkout, current local collection fails before tests run due existing test setup/import issues (saveddata.db path on normal run, then IPortUser import under TRAVIS=true).