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>

examples/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "oxide-examples"
+description = "Oxide Engine — runnable examples"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+rust-version.workspace = true
+publish = false
+
+[dependencies]
+oxide-engine = { path = "../engine" }
+oxide-physics = { path = "../physics" }
+oxide-script = { path = "../script" }
+log.workspace = true
+env_logger.workspace = true
+anyhow.workspace = true
+
+# Each example is a standalone binary in `src/bin/`. Run with:
+#   cargo run -p oxide-examples --bin <name>