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>

alembic/versions_backup/l0a1b2c3d4e5_add_capacity_snapshots_table.py

@@ -7,9 +7,9 @@ Create Date: 2025-12-26
 Adds table for tracking daily platform capacity metrics for growth forecasting.
 """
 
-from alembic import op
 import sqlalchemy as sa
 
+from alembic import op
 
 # revision identifiers, used by Alembic.
 revision = "l0a1b2c3d4e5"