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/seed/seed_email_templates.py

@@ -5,6 +5,7 @@ Seed default email templates.
 Run: python scripts/seed_email_templates.py
 """
 
+import contextlib
 import json
 import sys
 from pathlib import Path
@@ -25,15 +26,12 @@ for _mod in [
     "app.modules.marketplace.models",
     "app.modules.cms.models",
 ]:
-    try:
+    with contextlib.suppress(ImportError):
         __import__(_mod)
-    except ImportError:
-        pass
 
 from app.core.database import get_db
 from app.modules.messaging.models import EmailCategory, EmailTemplate
 
-
 # =============================================================================
 # EMAIL TEMPLATES
 # =============================================================================