fix: fehlende get_canonical_service Factory + BaseModel Imports

canonical_control_routes: get_canonical_service() Dependency-Factory
fehlte nach Refactoring → alle /v1/canonical/* Endpoints gaben 404.

dsfa_routes: pydantic BaseModel Import fehlte → Router lud nicht.

Startup-Log vorher: "Loaded 37/41 compliance sub-routers"
Startup-Log nachher: "Loaded 41/41 compliance sub-routers" (erwartet)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend-compliance/compliance/api/dsfa_routes.py

@@ -27,6 +27,7 @@ import logging
 from typing import Any, Optional
 
 from fastapi import APIRouter, Depends, Query
+from pydantic import BaseModel
 from fastapi.responses import Response
 from sqlalchemy.orm import Session