Add Docker image, Compose, CI/CD workflows and docs

- Multi-arch (amd64/arm64) panel image: static musl binary on scratch,
  cross-compiled with cargo-zigbuild (no QEMU), non-root, healthcheck
- docker-compose.yml + .env.example for one-command deployment
- CI: fmt, clippy, tests, web type-checks, Windows launcher build,
  real-network installs of vanilla/Fabric/Quilt/Forge/NeoForge,
  Docker build
- Release: Windows NSIS installer with baked-in panel URL, GHCR image
  push and GitHub release (tag push or manual dispatch)
- README, admin guide, Microsoft auth setup, architecture, development
- rustfmt config and formatting pass

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011ARcGWxLx21FwXJ3yfGriS

crates/core/tests/online.rs

@@ -7,11 +7,20 @@ use scopenet_core::{progress, Layout};
 use scopenet_shared::Loader;
 
 async fn run(mc: &str, loader: Loader) {
-    let root = std::env::var("SCOPENET_TEST_ROOT").map(std::path::PathBuf::from).unwrap_or_else(|_| std::env::temp_dir().join("scopenet-online"));
+    let root =
+        std::env::var("SCOPENET_TEST_ROOT").map(std::path::PathBuf::from).unwrap_or_else(|_| std::env::temp_dir().join("scopenet-online"));
     let layout = Layout::new(&root);
     let client = scopenet_core::http::client();
     let game_dir = layout.instance_dir(&format!("{mc}-{}", loader.as_str()));
-    let spec = InstallSpec { mc_version: mc.into(), loader, loader_version: None, java_override: None, game_dir: game_dir.clone(), concurrency: 16, deep_verify: false };
+    let spec = InstallSpec {
+        mc_version: mc.into(),
+        loader,
+        loader_version: None,
+        java_override: None,
+        game_dir: game_dir.clone(),
+        concurrency: 16,
+        deep_verify: false,
+    };
     let installed = install(&client, &layout, &spec, &progress::noop()).await.unwrap_or_else(|e| panic!("{mc} {loader:?}: {e:#}"));
 
     for path in installed.classpath(&layout) {
@@ -20,7 +29,13 @@ async fn run(mc: &str, loader: Loader) {
     assert!(installed.java.exists(), "java missing at {}", installed.java.display());
 
     let opts = LaunchOptions {
-        auth: Auth { username: "CiBot".into(), uuid: scopenet_shared::offline_uuid("CiBot"), access_token: "0".into(), user_type: "legacy".into(), xuid: None },
+        auth: Auth {
+            username: "CiBot".into(),
+            uuid: scopenet_shared::offline_uuid("CiBot"),
+            access_token: "0".into(),
+            user_type: "legacy".into(),
+            xuid: None,
+        },
         game_dir,
         memory_min_mb: 512,
         memory_max_mb: 2048,