fix(integration): fix srvx static path resolution for tanstack-start

srvx resolves --static path relative to the entry file directory
(dist/server/), not CWD. Use ../client to correctly resolve to
dist/client/ where built assets live.

Author: jacekradko

integration/templates/tanstack-react-start/package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "build": "vite build",
     "dev": "vite dev --port=$PORT",
-    "start": "srvx --static dist/client dist/server/server.js"
+    "start": "srvx --static ../client dist/server/server.js"
   },
   "dependencies": {
     "@tanstack/react-router": "1.157.16",