Initial commit: Brass & Sigil monorepo

Self-hosted Minecraft modpack distribution + administration system.

- launcher/  Avalonia 12 desktop client; single-file win-x64 publish.
             Microsoft auth via XboxAuthNet, manifest+SHA-1 mod sync,
             portable install path, sidecar settings.
- server/    brass-sigil-server daemon (.NET 8, linux-x64). Wraps the
             MC subprocess, embedded Kestrel admin panel with cookie
             auth + rate limiting, RCON bridge, scheduled backups,
             BlueMap CLI integration with player markers + skin proxy,
             friend-side whitelist request flow, world wipe with seed
             selection (keep current / random / custom).
- pack/      pack.lock.json (Modrinth + manual CurseForge entries),
             data-only tweak source under tweaks/, build outputs in
             overrides/ (gitignored).
- scripts/   Build-Pack / Build-Tweaks / Update-Pack / Check-Updates
             plus Deploy-Brass.ps1 unified one-shot deploy with
             version-bump pre-flight and daemon-state detection.

server/wwwroot/modules/serverControls.js

@@ -0,0 +1,16 @@
+// Start / stop buttons.
+"use strict";
+
+import { api } from "./api.js";
+
+export function setupServerControls() {
+    document.getElementById("btnStart").addEventListener("click", async () => {
+        try { await api("/api/server/start", { method: "POST" }); }
+        catch (e) { alert(e.message); }
+    });
+    document.getElementById("btnStop").addEventListener("click", async () => {
+        if (!confirm("Stop the server?")) return;
+        try { await api("/api/server/stop", { method: "POST" }); }
+        catch (e) { alert(e.message); }
+    });
+}