ImitationTestCase::seedPhoneRange used non-existent columns (range_from/range_to/region_name) and omitted the required import_id FK, so every Россвязь-branch test that called it failed. Now seeds a phone_ranges_imports anchor row and inserts phone_ranges with the real columns (def_code/from_num/to_num/operator/region/subject_code/imported_at/import_id), mirroring the verified RossvyazPrefixLookup parsing. Found during Task 5.
Дмитрий