[PPeitsch]

Description

Closes the last two partial findings of the code review:

• M4: init_db.py was in Spanish while the UI and docs are in English, and it ran pip install on its own when a package was missing. Now every prompt and message is in English (y/n), and a missing dependency prints the list plus pip install -r requirements.txt and exits with code 1. The fallback .env (when there is neither .env nor .env.example) had stale holiday settings from before feat: holiday provider for any country (Nager.Date) #51 and a fixed SECRET_KEY; it now gets HOLIDAY_COUNTRY=AR and a random key, and the script asks for the holiday country when configuring.
• M2: the tests still used the legacy Employee.query.get(); they use db.session.get() now. No LegacyAPIWarning is left in the suite.

Type of Change

• Refactoring
• Test coverage

Testing

• install_missing_packages tests replaced by a test that main() exits and points to requirements.txt.
• pytest -W error::sqlalchemy.exc.LegacyAPIWarning (254 passed), black, isort, mypy clean.
• Ran init_db.py end to end on a scratch copy without .env: SQLite, migrations, login user, sample data; the generated .env has the new keys.

Screenshots

Not applicable: CLI script.

Checklist

• I have read the contributing guidelines
• I have followed the project's code style (Black, isort, PEP 8)
• My code generates no new warnings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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