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

package-lock.json

@@ -577,6 +577,10 @@
       "dev": true,
       "license": "MIT"
     },
+    "examples/qr-server": {
+      "name": "@modelcontextprotocol/server-qr",
+      "version": "1.0.0"
+    },
     "examples/scenario-modeler-server": {
       "name": "@modelcontextprotocol/server-scenario-modeler",
       "version": "0.4.0",
@@ -2412,6 +2416,10 @@
       "resolved": "examples/pdf-server",
       "link": true
     },
+    "node_modules/@modelcontextprotocol/server-qr": {
+      "resolved": "examples/qr-server",
+      "link": true
+    },
     "node_modules/@modelcontextprotocol/server-scenario-modeler": {
       "resolved": "examples/scenario-modeler-server",
       "link": true