Import Oxide engine (Stages 0–10) under MIT license

Full project snapshot migrated to new Gitea remote without history:
engine, editor, physics, script, examples, tests, docs, and assets.
Relicensed from GPLv3 to MIT and updated repo URLs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

engine/src/asset/mod.rs

@@ -0,0 +1,32 @@
+//! Asset loading and management.
+//!
+//! Stage 4 introduced the first importer: a static-mesh [`glTF`](gltf) loader
+//! that turns a `.gltf`/`.glb` file into engine [`Mesh`](crate::render::Mesh)es,
+//! [`Material`](crate::render::Material)s, and placement [`Transform`](crate::math::Transform)s.
+//!
+//! Stage 5 adds the [`AssetServer`]: a central registry that loads assets through
+//! pluggable [`AssetLoader`]s, deduplicates by path+type, and hands out
+//! reference-counted [`Handle`]s (an asset lives as long as a handle to it does).
+//! It supports synchronous and background loading and in-place [reload](AssetServer::reload),
+//! the foundation later stages build live reload, streaming, and export packing
+//! on. The standalone [`load_gltf`] importer stays available; the server reaches
+//! it through the built-in [`GltfLoader`].
+
+mod database;
+mod gltf;
+mod handle;
+mod server;
+
+pub use database::{
+    asset_ref_target, AssetDatabase, AssetEntry, AssetKind, AssetRef, AssetUid, ASSET_MANIFEST_FILE,
+};
+pub use gltf::{load_gltf, load_gltf_slice, GltfError, GltfLoader, GltfMesh, GltfModel};
+pub use handle::{AssetId, Handle, LoadState};
+pub use server::{AssetError, AssetLoader, AssetServer};
+
+/// Registers the engine's built-in asset loaders on `server`. Called by
+/// [`AssetServer::new`].
+pub(crate) fn register_default_loaders(server: &AssetServer) {
+    server.register_loader(GltfLoader);
+    server.register_loader(crate::ui::FontLoader);
+}