Add mappings module with pokemon form, location area, encounter method,
and version mappings. Auto-download PokeDB JSON exports from CDN on
first run, caching in .pokedb_cache/.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Set up tools/import-pokedb/ with CLI, JSON loader, and output models.
Replaces the Go/PokeAPI approach with local PokeDB.org JSON processing.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>