fix(build): bump the client to vite 8.1.0 so the amd64 image builds

The 3.1.3 docker build failed on linux/amd64 while bundling the client
(arm64 happened to pass): vite 8.0.16 pins rolldown 1.0.3, but tsdown
pulls rolldown 1.1.2, and on amd64 npm hoists the 1.1.2 native binding so
vite's 1.0.3 rolldown loaded a mismatched one ("builtin:vite-wasm-fallback
does not match any variant of BindingBuiltinPluginName"). Moving the client
to vite 8.1.0, which expects rolldown 1.1.2, lines the bundler up with the
hoisted binding. Verified by building the client in a clean linux/amd64
node:22 container.

client/package.json

@@ -82,7 +82,7 @@
     "tailwindcss": "^3.4.1",
     "typescript": "^6.0.2",
     "typescript-eslint": "^8.58.2",
-    "vite": "^8.0.16",
+    "vite": "8.1.0",
     "vite-plugin-pwa": "^1.3.0",
     "vitest": "^4.1.9"
   }