Problem:
When loading a save (e.g., from year 106), events from year 100 would appear.
This happened because the game auto-started on server startup and client
connection, generating initialization events before the user could load a save.
Solution:
1. Backend: Keep game paused on startup even if LLM check passes
2. Backend: Remove auto-resume on first WebSocket connection
3. Frontend: Start with game paused (isManualPaused = true)
Now the user must explicitly click 'resume' to start a new game, or load a
save first. This prevents the race condition where game_loop generates events
with stale world state.
- Fix load_game to use World.create_with_db() for SQLite event storage
- Add get_events_db_path() to compute event database path from save path
- Add JSON to SQLite migration for backward compatibility with old saves
- Close old EventManager before loading new save to prevent connection leaks
- Add events_db metadata to save file
- Add comprehensive tests for database switching bug and save/load cycle
