fix: CI stop archipelago service before replacing binary

The running binary locks the file, causing 'Text file busy' on cp.
Stop the service, copy, then restart.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-iso.yml

@@ -19,7 +19,9 @@ jobs:
         run: |
           source $HOME/.cargo/env 2>/dev/null || true
           cargo build --release --manifest-path core/Cargo.toml
+          sudo systemctl stop archipelago 2>/dev/null || true
           sudo cp core/target/release/archipelago /usr/local/bin/archipelago
+          sudo systemctl start archipelago 2>/dev/null || true
 
       - name: Build frontend
         run: cd neode-ui && npm ci && npm run build