feat: implement pivot-currency model, rbac smart tokens & fix circular imports

backend/app/schemas/asset_cost.py

@@ -0,0 +1,35 @@
+from pydantic import BaseModel, Field
+from typing import Optional, Dict, Any
+from datetime import datetime
+from decimal import Decimal
+from uuid import UUID
+
+class AssetCostBase(BaseModel):
+    """Alap költség adatok (Frontendről érkező bevitel)."""
+    cost_type: str = Field(..., description="fuel, service, fine, insurance, toll, etc.")
+    amount_local: Decimal = Field(..., description="A fizetett bruttó összeg helyi devizában")
+    currency_local: str = Field("HUF", min_length=3, max_length=3)
+    date: datetime = Field(default_factory=datetime.now)
+    mileage_at_cost: Optional[int] = Field(None, description="Kilométeróra állása a költség rögzítésekor")
+    description: Optional[str] = None
+    net_amount_local: Optional[Decimal] = None
+    vat_rate: Optional[Decimal] = Field(27.0, description="ÁFA kulcs (pl. 27.0)")
+    data: Optional[Dict[str, Any]] = Field(default_factory=dict, description="Extra adatok (pl. helyszín, számlaszám)")
+
+class AssetCostCreate(AssetCostBase):
+    """Költség rögzítésekor használt séma."""
+    asset_id: UUID
+    organization_id: int
+
+class AssetCostResponse(AssetCostBase):
+    """Visszatérő adat modell a frontend felé."""
+    id: UUID
+    asset_id: UUID
+    organization_id: int
+    driver_id: Optional[int]
+    amount_eur: Decimal
+    exchange_rate_used: Decimal
+    created_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True