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.

.gitignore

@@ -0,0 +1,62 @@
+# ─── .NET build outputs ───────────────────────────────────────────────────
+bin/
+obj/
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ll]og/
+[Ll]ogs/
+*.pdb
+*.user
+*.suo
+*.userosscache
+*.sln.docstates
+
+# ─── IDE state ────────────────────────────────────────────────────────────
+.vs/
+.vscode/
+.idea/
+*.sln.iml
+
+# ─── NuGet / package caches ───────────────────────────────────────────────
+*.nupkg
+*.snupkg
+.nuget/
+packages/
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# ─── Build / publish output (every project) ───────────────────────────────
+publish/
+
+# ─── Misc OS junk ─────────────────────────────────────────────────────────
+*.swp
+.DS_Store
+Thumbs.db
+
+# ─── Local secrets / runtime config (track template, ignore real values) ─
+launcher/launcher-config.json
+server/deploy/server-config.json
+scripts/deploy.config.ps1
+
+# ─── Local AI assistant artifacts (Claude, Cursor, Copilot) ───────────────
+# Kept out of the public repo so collaborators aren't surprised by tool-
+# specific orientation files. Local copies stay usable in the working tree.
+CLAUDE.md
+.claude/
+.cursor/
+.cursorrules
+.aider*
+.github/copilot*
+
+# ─── Build artifacts that get regenerated ─────────────────────────────────
+# Tweak jars rebuilt by scripts/Build-Tweaks.ps1
+pack/overrides/
+# manifest.json regenerated by scripts/Build-Pack.ps1 -- produced at scripts/
+# (default OutputPath) and copied to the deploy share by Deploy-Brass.ps1
+scripts/manifest.json
+pack/manifest.json