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.
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