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/server.py

@@ -1,3 +1,13 @@
+#!/usr/bin/env uv run
+# /// script
+# requires-python = ">=3.10"
+# dependencies = [
+#     "mcp>=1.9.0",
+#     "qrcode[pil]>=8.0",
+#     "uvicorn>=0.34.0",
+#     "starlette>=0.46.0",
+# ]
+# ///
 """
 QR Code MCP Server - Generates QR codes from text
 """