feat(qr-server): migrate to uv with PEP 723 inline dependencies

- Replace requirements.txt with inline script dependencies in server.py
- Add package.json with npm scripts for run-all.ts integration
- Update CI workflow to install uv via astral-sh/setup-uv@v5
- Update Docker commands to install uv for e2e tests
- Add Playwright golden screenshot for qr-server
- Update README with uv installation and usage instructions

examples/qr-server/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "@modelcontextprotocol/server-qr",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "start": "uv run server.py",
+    "dev": "uv run server.py",
+    "build": "echo 'No build step needed for Python server'"
+  }
+}