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/Services/JsonOpts.cs

@@ -0,0 +1,24 @@
+using System.Text.Json;
+
+namespace BrassAndSigil.Server.Services;
+
+/// <summary>
+/// Project-wide JSON serializer options. Always case-insensitive on read so that
+/// hand-edited config files / API responses don't silently fail to bind a property
+/// because of a casing mismatch (e.g. "Command" vs "command", "JavaPath" vs "javaPath").
+/// Use this everywhere we call JsonSerializer.Deserialize.
+/// </summary>
+public static class JsonOpts
+{
+    public static readonly JsonSerializerOptions CaseInsensitive = new()
+    {
+        PropertyNameCaseInsensitive = true,
+        ReadCommentHandling = JsonCommentHandling.Skip,
+        AllowTrailingCommas = true,
+    };
+
+    public static readonly JsonSerializerOptions Pretty = new()
+    {
+        WriteIndented = true,
+    };
+}