feat(registry): extract block, item, and biome registries from oxidized-world

Move the complete registry subsystem into a standalone crate:
- Block registry with O(1) state ID lookup (29,872 states)
- Item registry with bidirectional name/ID mapping (1,506 items)
- Biome registry with 65 vanilla biomes
- Block tags with O(log n) membership testing
- Build-time code generation from embedded vanilla JSON data
- All 97 unit tests + 5 doc-tests passing

Author: dodoflix

Cargo.toml

@@ -12,9 +12,17 @@ keywords     = ["minecraft", "oxidized-mc"]
 categories   = ["game-development"]
 
 [dependencies]
+thiserror = "2"
+bitflags  = "2"
+
+[build-dependencies]
+serde_json = { version = "1", features = ["preserve_order"] }
+serde      = { version = "1", features = ["derive"] }
+flate2     = "1"
 
 [dev-dependencies]
 proptest = "1"
+insta    = "1"
 
 [lints.rust]
 missing_docs   = "warn"