Commit web/assets/maps/ WebPs so deploys are self-contained

121 MB across 66 dungeon-floor WebPs (~150 KB–6 MB each). Previously
gitignored on the assumption LFS would be needed; plain git handles this
fine and it removes the kg_fetch → kg_stitch dependency from the deploy
path. README and Ansible bring-up step updated.

.gitignore

@@ -13,11 +13,9 @@ Thumbs.db
 .idea/
 *.swp
 
-# Large data assets — not tracked in git (no LFS yet)
+# Large data assets
 # legacy hires PNG dump (gone, but keep ignored)
 data/maps_png_hires/
-# 336 MB of WebP map tiles — exclude until LFS is set up
-web/assets/maps/
 
 # Build output
 output/