fix: resolve ruff violations in GP scripts and main.py

- Use .values() instead of .items() when attr_name is unused (B007/PERF102)
- Split long print f-string to stay under 120 chars (E501)
- Add blank line in docstring between summary and description (D205)
- Use ternary operator for locale assignment in main.py (SIM108)

scripts/gp/extract_backend_strings.py

@@ -51,7 +51,7 @@ def collect_strings() -> dict[str, str]:
             print(f"  SKIP {modname}: {e}")
             continue
 
-        for attr_name, cls in vars(module).items():
+        for cls in vars(module).values():
             if not isinstance(cls, type):
                 continue
             # Only process classes defined in this module (avoid re-processing imports)
@@ -109,7 +109,9 @@ def main() -> None:
     print("Scanning lfx.components for translatable strings...")
     strings = collect_strings()
     print(
-        f"Found {len(strings)} translatable keys across {sum(1 for k in strings if k.endswith('.display_name') and '.inputs.' not in k and '.outputs.' not in k)} components."
+        f"Found {len(strings)} translatable keys across "
+        f"{sum(1 for k in strings if k.endswith('.display_name') and '.inputs.' not in k and '.outputs.' not in k)}"
+        " components."
     )
 
     new_content = json.dumps(strings, ensure_ascii=False, indent=2) + "\n"

scripts/gp/tests/test_extract_backend_strings.py

@@ -34,6 +34,7 @@ class TestExtractBackendStrings:
 
     def test_writes_keys_in_order_returned_by_collect_strings(self, tmp_path):
         """main() writes keys in the order collect_strings() returns them.
+
         collect_strings() always returns sorted keys, so the output is sorted in practice.
         """
         output_file = tmp_path / "en.json"

src/backend/base/langflow/main.py

@@ -518,10 +518,7 @@ def create_app():
         """
         accept_lang = request.headers.get("Accept-Language", "en")
         primary = accept_lang.split(",")[0].strip()
-        if primary.lower().startswith("zh-hans"):
-            locale = "zh-Hans"
-        else:
-            locale = primary.split("-")[0] or "en"
+        locale = "zh-Hans" if primary.lower().startswith("zh-hans") else primary.split("-")[0] or "en"
         request.state.locale = locale
         return await call_next(request)