MAESTRO: add tests endpoint schema

backend/app/routers/tests.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from fastapi import APIRouter
+
+from app.engine.scanner_registry import ScannerRegistry
+from app.schemas.tests import TestResponse
+
+router = APIRouter(prefix="/api", tags=["tests"])
+
+
+@router.get("/tests", response_model=list[TestResponse])
+def list_tests() -> list[TestResponse]:
+    registry = ScannerRegistry()
+    tests = registry.list_tests()
+    return [TestResponse.model_validate(test) for test in tests]