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/src/loaders/forge.rs

@@ -253,11 +253,8 @@ async fn run_processors(ctx: &ForgeInstall<'_>, zip: &mut Zip, profile: &Install
     data.insert("LIBRARY_DIR".into(), libs_dir.to_string_lossy().into_owned());
 
     let sep = if cfg!(windows) { ";" } else { ":" };
-    let processors: Vec<&Processor> = profile
-        .processors
-        .iter()
-        .filter(|p| p.sides.as_ref().map(|s| s.iter().any(|x| x == "client")).unwrap_or(true))
-        .collect();
+    let processors: Vec<&Processor> =
+        profile.processors.iter().filter(|p| p.sides.as_ref().map(|s| s.iter().any(|x| x == "client")).unwrap_or(true)).collect();
     let total = processors.len() as u32;
 
     for (i, proc) in processors.into_iter().enumerate() {