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.

launcher/ModpackLauncher.csproj

@@ -0,0 +1,65 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <!-- net8.0-windows is required for the XboxAuthNet WebView2 OAuth flow:
+         the netstandard2.0 build of XboxAuthNet has no WebUI implementation. -->
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
+    <Nullable>enable</Nullable>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    <RootNamespace>ModpackLauncher</RootNamespace>
+    <AssemblyName>ModpackLauncher</AssemblyName>
+    <Version>0.4.5</Version>
+    <ApplicationIcon Condition="Exists('Assets\icon.ico')">Assets\icon.ico</ApplicationIcon>
+
+    <!-- Single-file self-contained publish defaults (Windows-only now due to WebView2) -->
+    <RuntimeIdentifier Condition="'$(RuntimeIdentifier)' == ''">win-x64</RuntimeIdentifier>
+    <RuntimeIdentifiers>win-x64</RuntimeIdentifiers>
+    <PublishSingleFile>true</PublishSingleFile>
+    <SelfContained>true</SelfContained>
+    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+    <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
+    <DebugType>embedded</DebugType>
+    <CopyDebugSymbolFilesFromPackages>false</CopyDebugSymbolFilesFromPackages>
+    <CopyDocumentationFilesFromPackages>false</CopyDocumentationFilesFromPackages>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="12.0.2" />
+    <PackageReference Include="Avalonia.Desktop" Version="12.0.2" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="12.0.2" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="12.0.2" />
+    <PackageReference Include="AvaloniaUI.DiagnosticsSupport" Version="2.2.1">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="CmlLib.Core" Version="4.0.6" />
+    <PackageReference Include="CmlLib.Core.Auth.Microsoft" Version="3.3.1" />
+    <PackageReference Include="CmlLib.Core.Installer.Forge" Version="1.1.1" />
+    <PackageReference Include="CmlLib.Core.Installer.NeoForge" Version="4.0.0" />
+    <PackageReference Include="XboxAuthNet.Game.Msal" Version="0.1.3" />
+    <PackageReference Include="fNbt" Version="0.7.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="launcher-config.json" Condition="Exists('launcher-config.json')">
+      <LogicalName>launcher-config.json</LogicalName>
+    </EmbeddedResource>
+    <EmbeddedResource Include="launcher-config.template.json">
+      <LogicalName>launcher-config.template.json</LogicalName>
+    </EmbeddedResource>
+  </ItemGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Include="Assets\icon.png" />
+    <AvaloniaResource Include="Assets\noise.png" />
+  </ItemGroup>
+
+  <Target Name="StripNativePdbs" AfterTargets="Publish">
+    <ItemGroup>
+      <_StripPdb Include="$(PublishDir)*.pdb" Exclude="$(PublishDir)$(AssemblyName).pdb" />
+    </ItemGroup>
+    <Delete Files="@(_StripPdb)" />
+  </Target>
+</Project>