feat: add repair timeline read APIs

backend/tests/test_repairs_router.py

@@ -236,7 +236,7 @@ class RepairRouterTests(unittest.TestCase):
         routes = [
             (route.path, route.methods)
             for route in router.routes
-            if hasattr(route, "methods")
+            if hasattr(route, "methods") and "POST" in route.methods
         ]
         self.assertEqual(routes, [("/api/repairs", {"POST"})])