refactor: 集中 AST 缓存逻辑实现并清理无关依赖

Cargo.lock

@@ -771,6 +771,7 @@ dependencies = [
 name = "oxide_compiler"
 version = "0.1.0"
 dependencies = [
+ "oxide_kernel",
  "oxide_parser",
  "rustc-hash",
  "serde",
@@ -781,7 +782,6 @@ dependencies = [
 name = "oxide_kernel"
 version = "0.1.0"
 dependencies = [
- "bumpalo",
  "dashmap",
  "hashbrown 0.14.5",
  "oxide_compiler",
@@ -822,7 +822,6 @@ dependencies = [
  "oxide_parser",
  "oxide_types",
  "proptest",
- "rustc-hash",
  "ryu",
 ]