feat(native): cleanup vendored deps (#15119)

#### PR Dependency Tree


* **PR #15119** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Breaking Changes**
* Removed major Rust public APIs related to document/CRDT encoding,
synchronization, and document loading from the affected packages.
* **Chores**
* Migrated internal dependency usage to published crates and trimmed the
Rust workspace/feature surface.
* **CI/CD**
* Simplified the Rust CI pipeline by removing advanced testing jobs and
updating job dependencies.
* **Dev/Test/Bench**
* Removed associated benchmark and fuzzing artifacts and related
fixture/test utilities.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/native/src/doc_loader.rs

@@ -1,4 +1,5 @@
-use affine_common::{doc_loader::Doc, napi_utils::map_napi_err};
+use affine_common::napi_utils::map_napi_err;
+use doc_extractor::Doc;
 use napi::{
   Env, Result, Status, Task,
   bindgen_prelude::{AsyncTask, Buffer},