fix(ci): generate tfstate stub before server build in integration script

app:test:integration called `npm run build -w @gsd/server` directly,
bypassing the game-server-manager prebuild hook that runs
embed-tfstate.mjs. Since generated/tfstate.ts is in .gitignore and
only created by that hook, tsc -b failed with "Cannot find module
'../generated/tfstate.js'". Prepend the embed script so the stub
(null in CI) is written before tsc runs.

https://claude.ai/code/session_01UAVwJvuBtUaDYFXtJRheww

Author: claude

package.json

@@ -20,7 +20,7 @@
     "app:lint": "npm run lint           -w game-server-manager",
     "app:lint:fix": "npm run lint:fix       -w game-server-manager",
     "app:test:e2e": "npm run test:e2e       -w @gsd/web",
-    "app:test:integration": "npm run build -w @gsd/server && npm run test:integration -w @gsd/web",
+    "app:test:integration": "node app/scripts/embed-tfstate.mjs && npm run build -w @gsd/server && npm run test:integration -w @gsd/web",
     "scripts:init-parent": "npm run init-parent  -w @gsd/scripts"
   }
 }