feat: initial PSG Launcher scaffold

.gitignore

@@ -0,0 +1,43 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+dist-ssr/
+
+# Tauri build artifacts
+src-tauri/target/
+src-tauri/gen/
+
+# Logs
+*.log
+npm-debug.log*
+
+# Editor
+.vscode/*
+!.vscode/extensions.json
+.idea/
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Keys — NEVER commit private keys
+keys/
+*.key
+*.pem
+!manifests/*.json
+
+# Env
+.env
+.env.local
+.env.*.local
+
+# Tauri signing env vars (set in CI secrets, not files)
+# TAURI_SIGNING_PRIVATE_KEY
+# TAURI_SIGNING_PRIVATE_KEY_PASSWORD