ci(windows): build/clippy/fmt/test workflow on the self-hosted Windows runner

runs-on: windows-amd64 (home-windows-1, host mode). Build + clippy(-D warnings) + fmt + test the
WinUI 3 client. The toolchain is baked into the runner's daemon env; the workflow only sets
CARGO_WORKSPACE_DIR=${{ github.workspace }} (windows-reactor's build.rs needs it). Triggers on
changes to the windows crate / core / Cargo / this workflow.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/windows.yml

@@ -0,0 +1,59 @@
+# Windows client CI — runs on the self-hosted Windows runner (home-windows-1, host mode; see
+# scripts/ci/setup-windows-runner.ps1). Build + clippy + fmt + test the WinUI 3 client
+# (windows-reactor + D3D11/SwapChainPanel + WASAPI + SDL3) on x86_64-pc-windows-msvc.
+#
+# The MSVC/WinUI/FFmpeg toolchain (cargo/rustup on ASCII paths, NASM, CMake, LLVM, FFmpeg,
+# CARGO_HOME, CMAKE_POLICY_VERSION_MINIMUM, …) is baked into the runner's daemon env, so jobs
+# inherit it. The one per-checkout var is CARGO_WORKSPACE_DIR — windows-reactor's build.rs
+# unwraps it and stages the Windows App SDK NuGets + winmd under it.
+name: windows
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'crates/punktfunk-client-windows/**'
+      - 'crates/punktfunk-core/**'
+      - 'Cargo.lock'
+      - 'Cargo.toml'
+      - '.gitea/workflows/windows.yml'
+  pull_request:
+    paths:
+      - 'crates/punktfunk-client-windows/**'
+      - 'crates/punktfunk-core/**'
+      - 'Cargo.lock'
+      - 'Cargo.toml'
+      - '.gitea/workflows/windows.yml'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: windows-amd64
+    timeout-minutes: 60
+    env:
+      # windows-reactor's build.rs `.unwrap()`s this and writes /temp + /winmd under it.
+      CARGO_WORKSPACE_DIR: ${{ github.workspace }}
+    defaults:
+      run:
+        shell: powershell
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Toolchain + workspace path
+        run: |
+          rustc --version
+          cargo --version
+          node --version
+          Write-Output "workspace: $env:GITHUB_WORKSPACE"
+
+      - name: Build
+        run: cargo build -p punktfunk-client-windows
+
+      - name: Clippy (-D warnings)
+        run: cargo clippy -p punktfunk-client-windows --all-targets -- -D warnings
+
+      - name: Rustfmt check
+        run: cargo fmt -p punktfunk-client-windows -- --check
+
+      - name: Test
+        run: cargo test -p punktfunk-client-windows