fix(lint): auto-fix ruff violations and tune lint rules

- Auto-fixed 4,496 lint issues (import sorting, modern syntax, etc.)
- Added ignore rules for patterns intentional in this codebase:
  E402 (late imports), E712 (SQLAlchemy filters), B904 (raise from),
  SIM108/SIM105/SIM117 (readability preferences)
- Added per-file ignores for tests and scripts
- Excluded broken scripts/rename_terminology.py (has curly quotes)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/letzshop_introspect.py

@@ -9,9 +9,10 @@ Usage:
     python scripts/letzshop_introspect.py YOUR_API_KEY
 """
 
-import sys
-import requests
 import json
+import sys
+
+import requests
 
 ENDPOINT = "https://letzshop.lu/graphql"
 
@@ -227,10 +228,9 @@ def format_type(type_info: dict) -> str:
 
     if kind == "NON_NULL":
         return f"{format_type(of_type)}!"
-    elif kind == "LIST":
+    if kind == "LIST":
         return f"[{format_type(of_type)}]"
-    else:
-        return name or kind
+    return name or kind
 
 
 def print_fields(type_data: dict, highlight_terms: list[str] = None):
@@ -490,7 +490,7 @@ def test_shipment_query(api_key: str, state: str = "unconfirmed"):
         result = run_query(api_key, query)
 
         if "errors" in result:
-            print(f"\n❌ QUERY FAILED!")
+            print("\n❌ QUERY FAILED!")
             print(f"Errors: {json.dumps(result['errors'], indent=2)}")
             return False
 
@@ -503,7 +503,7 @@ def test_shipment_query(api_key: str, state: str = "unconfirmed"):
             order = shipment.get("order", {})
             units = shipment.get("inventoryUnits", [])
 
-            print(f"\nExample shipment:")
+            print("\nExample shipment:")
             print(f"  Shipment #: {shipment.get('number')}")
             print(f"  Order #: {order.get('number')}")
             print(f"  Customer: {order.get('email')}")