Multi-arch release script + Gitea workflow; retire legacy BunSCP name

bun run release -- --target mac-arm64|mac-x64|win-x64: gen version/icons,
build UI, electrobun build --env=stable, collect artifacts as
release/<target>/miniSCP-Build<n>-<target>.*. mac-x64 builds on the
arm64 Mac by running electrobun's x64 CLI under Rosetta 2 (verified:
x86_64 launcher in the produced app). Windows also zips a portable
build next to the Setup installer. Tag-triggered Gitea Actions matrix
included, inert until runners exist. legacyNames emptied — the BunSCP
migration has served its purpose.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -0,0 +1,46 @@
+# Release matrix — INERT until act_runner instances with these labels are
+# registered on git.teknes.es. Each OS builds its own artifacts (electrobun
+# cannot cross-compile: packaging needs codesign/hdiutil on macOS and
+# rcedit/PowerShell on Windows).
+#
+# Runner prerequisites:
+#   macos   — arm64 Mac: bun, Xcode CLT, Rosetta 2 (softwareupdate
+#             --install-rosetta), network to github.com (electrobun downloads
+#             its per-arch core binaries on first build)
+#   windows — Windows 11 x64: bun, network to github.com; WebView2 runtime is
+#             preinstalled on Win 11
+#
+# Trigger: push a tag like build-62 (git tag build-$(git rev-list --count HEAD)).
+name: release
+on:
+  push:
+    tags:
+      - "build-*"
+
+jobs:
+  mac:
+    runs-on: macos
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # full history — the build number is the commit count
+      - run: bun install --frozen-lockfile
+      - run: bun scripts/release.ts --target mac-arm64
+      - run: bun scripts/release.ts --target mac-x64
+      - uses: actions/upload-artifact@v3
+        with:
+          name: mac
+          path: release/**
+
+  windows:
+    runs-on: windows
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - run: bun install --frozen-lockfile
+      - run: bun scripts/release.ts --target win-x64
+      - uses: actions/upload-artifact@v3
+        with:
+          name: windows
+          path: release/**