MAESTRO: align tests API response with selector

Auto Run Docs/SpecKit-web-header-analyzer-Phase-04-Test-Selection.md

@@ -31,7 +31,7 @@ This phase implements the test selection panel and analysis configuration contro
 - [x] `pytest backend/tests/api/test_tests_router.py` passes
 - [x] `GET /api/tests` returns all 106+ tests with id, name, and category
 - [x] All vitest tests pass: `npx vitest run src/__tests__/TestSelector.test.tsx src/__tests__/AnalysisControls.test.tsx`
-- [ ] Test selector renders all 106+ tests with checkboxes
+- [x] Test selector renders all 106+ tests with checkboxes
 - [ ] Select All / Deselect All buttons work correctly
 - [ ] Search/filter narrows visible tests by name
 - [ ] DNS resolution toggle defaults to off

backend/app/routers/tests.py

@@ -3,13 +3,14 @@ from __future__ import annotations
 from fastapi import APIRouter
 
 from app.engine.scanner_registry import ScannerRegistry
-from app.schemas.tests import TestResponse
+from app.schemas.tests import TestListResponse, TestResponse
 
 router = APIRouter(prefix="/api", tags=["tests"])
 
 
-@router.get("/tests", response_model=list[TestResponse])
-def list_tests() -> list[TestResponse]:
+@router.get("/tests", response_model=TestListResponse)
+def list_tests() -> TestListResponse:
     registry = ScannerRegistry()
     tests = registry.list_tests()
-    return [TestResponse.model_validate(test.model_dump()) for test in tests]
+    response_tests = [TestResponse.model_validate(test.model_dump()) for test in tests]
+    return TestListResponse(tests=response_tests, total_count=len(response_tests))

backend/app/schemas/tests.py

@@ -1,7 +1,16 @@
 from __future__ import annotations
 
+from pydantic import BaseModel, ConfigDict, Field
+
 from app.engine.models import Test
 
 
 class TestResponse(Test):
     pass
+
+
+class TestListResponse(BaseModel):
+    model_config = ConfigDict(populate_by_name=True)
+
+    tests: list[TestResponse]
+    total_count: int = Field(alias="totalCount")

backend/tests/api/test_tests_router.py

@@ -22,9 +22,13 @@ async def test_get_tests_returns_all_registered_tests() -> None:
     assert response.status_code == 200
 
     payload = response.json()
-    assert isinstance(payload, list)
-    assert len(payload) == len(expected_lookup)
+    assert isinstance(payload, dict)
+    assert payload["totalCount"] == len(expected_lookup)
 
-    response_lookup = {item["id"]: item["name"] for item in payload}
+    tests_payload = payload["tests"]
+    assert isinstance(tests_payload, list)
+    assert len(tests_payload) == len(expected_lookup)
+
+    response_lookup = {item["id"]: item["name"] for item in tests_payload}
     assert len(response_lookup) == len(expected_lookup)
     assert response_lookup == expected_lookup