Release 0.1.0: MIT license, changelog, multi-arch Docker image without CLI builds

- LICENSE (MIT), CHANGELOG for 0.1.0, README overhaul
- docker-compose.release.yml pulling the registry image
- Dockerfile cross-compiles the server with cargo-zigbuild for amd64 and arm64;
  the terminal client is no longer built into the image
- Server, install script and settings point to a source install of the
  terminal client when no prebuilt binaries are available (/info: cli_builds)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/src/auth.rs

@@ -257,6 +257,7 @@ pub async fn info(State(app): State<Arc<App>>, headers: HeaderMap) -> Json<Value
         "commit": crate::update::commit(),
         "update": if user.as_ref().is_some_and(|u| u.is_admin()) { app.update.latest.lock().unwrap().clone() } else { None },
         "setup_required": app.setup_code.lock().unwrap().is_some(),
+        "cli_builds": crate::api::cli_builds_available(),
         "oidc": if cfg.auth.oidc.enabled { json!({"label": cfg.auth.oidc.button_label}) } else { Value::Null },
         "user": user,
     }))