Degrade gracefully when data-of-loathing is unavailable

[gausie]

Summary

• Bumps data-of-loathing to 4.3.1, which falls back to a cached local SQLite database when the remote server is unreachable (previously would throw immediately on any network error)
• Wraps DataOfLoathingClient.load() in a try/catch so a total load failure (first boot, no cache, server down) no longer crashes the bot — it starts in degraded mode with empty maps, which existing callers already handle gracefully via null checks
• lastDownloadTime is now updated unconditionally so a failed reload doesn't trigger a retry on every subsequent request
• Sends a Discord alert via discordClient.alert() if the bot starts in degraded mode

Tests

• DataOfLoathingClient: load doesn't throw on failure, loaded flag reflects success/failure, reload() doesn't retry within an hour after a failure
• PizzaTree: returns empty results when built with no data (degraded mode), correctly indexes hookah-eligible effects and excludes avatar effects, precalculate sets the right pizza metadata