Implement lazy initialization for UnimodDatabase

[Copilot]

Addresses feedback that unimod_database initialized at module import time hurts testability and prevents database refresh scenarios.

Changes

• Lazy initialization: Replace eager unimod_database = UnimodDatabase() with a get_unimod_database() getter that creates the instance on first access
• Cache pattern: Store instance in _unimod_database module variable, enabling tests to reset by setting to None
• Update callsite: get_mod() now uses get_unimod_database().modifications

_unimod_database = None

def get_unimod_database():
    global _unimod_database
    if _unimod_database is None:
        _unimod_database = UnimodDatabase()
    return _unimod_database

Benefits: faster module imports, easier mocking in tests, database only created when needed.

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