no-mistakes(document): Fix stale seed.py docstring and remove unused imports across 3 files

app/services/seed.py

@@ -1,6 +1,6 @@
-"""Seed script — users and units.
+"""Seed script — users, units, and categories.
 
-Called on first startup or via :func:`seed_all`.
+Called on first startup via lifespan hook.
 """
 
 from __future__ import annotations

app/services/sla.py

@@ -4,9 +4,6 @@ from __future__ import annotations
 
 from datetime import datetime, timedelta, timezone
 
-from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession
-
 from app.models.ticket import Ticket
 
 # ── Priority SLA Targets (from PRD §11) ──────────────────────────────

app/services/ticket.py

@@ -10,10 +10,10 @@ from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
-from app.models.ticket import Escalation, Ticket, TicketPhoto, TicketTimeline
+from app.models.ticket import Escalation, Ticket, TicketTimeline
 from app.models.unit import Unit
 from app.models.user import User
-from app.services.sla import compute_sla_deadline, get_sla_status
+from app.services.sla import compute_sla_deadline
 
 # ── Status Transition Map ────────────────────────────────────────────
 # Keys: current status → list of valid next statuses