ci: align backend lint checks

pyproject.toml

@@ -90,7 +90,16 @@ target-version = "py311"
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "B", "UP", "N", "PL", "RUF"]
-ignore = ["E501", "PLR0913", "PLR2004"]
+ignore = [
+    "E501",
+    "PLC0415",  # optional/heavy imports are intentionally lazy in runtime and tests
+    "PLR0913",
+    "PLR2004",
+    "PLW0603",  # lazy DB/session singletons are explicit module state
+    "RUF001",   # Russian OCR/test strings intentionally contain Cyrillic characters
+    "RUF002",
+    "RUF100",   # keep explanatory noqa markers for rules not enabled locally
+]
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]