👷 Add ty to precommit (#2227)

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

.pre-commit-config.yaml

@@ -47,6 +47,13 @@ repos:
         language: unsupported
         pass_filenames: false
 
+      - id: local-ty
+        name: ty check
+        entry: uv run ty check backend/app
+        require_serial: true
+        language: unsupported
+        pass_filenames: false
+
       - id: generate-frontend-sdk
         name: Generate Frontend SDK
         entry: bash ./scripts/generate-client.sh