fix(ci): run api-test orchestration from backend dir so prisma finds schema

npm exec ran prisma/tsx from the repo root, where ./prisma/schema.prisma
does not exist. cd into apps/backend first; reference the collection and
schema by package-relative paths.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Harxhit

.github/scripts/run-api-tests.sh

@@ -18,7 +18,7 @@ PORT="${PORT:-3000}"
 BASE_URL="http://localhost:${PORT}"
 HEALTH_RETRIES="${HEALTH_RETRIES:-30}"
 HEALTH_INTERVAL="${HEALTH_INTERVAL:-2}"
-COLLECTION="apps/backend/postman/DevCard.postman_collection.json"
+COLLECTION="postman/DevCard.postman_collection.json"
 
 SERVER_PID=""
 
@@ -31,13 +31,17 @@ cleanup() {
 }
 trap cleanup EXIT
 
+# Prisma and tsx resolve paths relative to the working directory, so run
+# everything from the backend package rather than the repo root.
+cd apps/backend
+
 echo "::group::Apply migrations and seed"
-npm --prefix apps/backend exec prisma migrate deploy
-npm --prefix apps/backend run db:seed
+npx prisma migrate deploy
+npm run db:seed
 echo "::endgroup::"
 
 echo "::group::Start API server"
-npm --prefix apps/backend exec tsx src/server.ts &
+npx tsx src/server.ts &
 SERVER_PID=$!
 echo "Server started (pid ${SERVER_PID})"
 echo "::endgroup::"