fix: use collect_all for mysql.connector to fix No module named 'mysql' in exe
mysql-connector-python 9.x restructured its package hierarchy. PyInstaller
fails to auto-discover submodules (aio, plugins, locales, etc.).
Updated DatabaseApp.spec to use collect_all('mysql.connector') which
walks the full package tree and bundles all required files.
Rebuilt DatabaseApp.exe (30.9 MB).
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