feat(fusion_accounting_assets): fusion.asset.engine 7-method API

The orchestrator AbstractModel for asset depreciation lifecycle.
compute_depreciation_schedule, post_depreciation_entry, dispose_asset,
partial_sale, pause_asset, resume_asset, reverse_disposal.

All controllers, AI tools, wizards, and cron must route through these
methods; no direct ORM writes to fusion.asset.depreciation.line or
account.move from anywhere else.

Made-with: Cursor

fusion_accounting_assets/models/__init__.py

@@ -4,3 +4,4 @@ from . import fusion_asset_depreciation_line
 from . import fusion_asset_disposal
 from . import fusion_asset_anomaly
 from . import account_move
+from . import fusion_asset_engine