Fix duplicate sub-areas caused by PokeAPI casing (e.g. 1f vs 1F)
PokeAPI returns both lowercase and uppercase floor names as separate sub-areas with identical encounter data, causing 649 duplicate routes across all 22 seed files. Merged case-insensitive duplicates, keeping the uppercase name and deduplicating encounters. Re-seed required. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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