Add data pipeline: fetch and parse Cheat mod DBs into JSON

Pulls items/perks/buffs/skills CSVs and command docs from
pryans/kcd2-cheat, parses the mod's CSV dialect (backslash-escaped
commas, multiline quoted fields) and BBCode command docs into
vendored JSON under src/data/.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/data/meta.json

@@ -0,0 +1 @@
+{"source":"https://github.com/pryans/kcd2-cheat","cheatModDocsVersion":"2.18","fetchedAt":"2026-07-13T07:06:21.835Z"}