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/app.js

@@ -0,0 +1,42 @@
+"use strict";
+
+import { tickStatus, tickPlayers, tickWhitelist, refreshWhitelistSoon } from "./modules/panels.js";
+import { setupConsole } from "./modules/console.js";
+import { setupAutocomplete } from "./modules/autocomplete.js";
+import { setupWhitelistActions } from "./modules/whitelist.js";
+import { setupServerControls } from "./modules/serverControls.js";
+import { setupPregen } from "./modules/pregen.js";
+import { setupAuth } from "./modules/auth.js";
+import { setupUpdate } from "./modules/update.js";
+import { setupDanger } from "./modules/danger.js";
+import { setupBackup } from "./modules/backup.js";
+import { setupModalTriggers } from "./modules/modal.js";
+import { setupSettings } from "./modules/settings.js";
+import { setupMap } from "./modules/map.js";
+
+setupModalTriggers();
+setupAuth();
+setupConsole();
+setupAutocomplete();
+setupWhitelistActions(refreshWhitelistSoon);
+setupServerControls();
+setupPregen();
+setupUpdate();
+setupBackup();
+setupDanger();
+setupSettings();
+setupMap();
+
+// First paint
+tickStatus();
+tickPlayers();
+tickWhitelist();
+
+// Polling cadence:
+//   status   3 s -- pid/uptime/pack version (cheap, doesn't change much)
+//   players 10 s -- RCON `list` call; players join/leave infrequently
+//   whitelist 30 s -- file read; mostly relies on refresh-on-action via add/remove
+// (Logs are NOT polled -- they stream live via Server-Sent Events from /api/logs/stream.)
+setInterval(tickStatus,    3000);
+setInterval(tickPlayers,  10000);
+setInterval(tickWhitelist, 30000);