fix: resolve @types/bun when Vercel compiles public-api with TypeScript 7

With TypeScript 7, @vercel/node compiles via a temporary tsconfig in the OS
temp dir that extends the project config, so default type roots resolve
from that temp dir and `types: ["bun"]` fails with TS2688. Pin typeRoots
relative to the public-api tsconfig so they survive being extended.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/public-api/tsconfig.json

@@ -1,4 +1,7 @@
 {
   "extends": "@sofa/tsconfig/base.json",
+  "compilerOptions": {
+    "typeRoots": ["./node_modules/@types", "../../node_modules/@types"]
+  },
   "include": ["src"]
 }