feat: stabilize KYC, international assets and multi-currency schema

- Split mother's name in KYC (last/first)
- Added mileage_unit and fuel_type to Assets
- Expanded AssetCost for international VAT and original currency
- Fixed SQLAlchemy IndexError in asset catalog lookup
- Added exchange_rate and ratings tables to models

backend/app/models/identity.py

@@ -2,9 +2,9 @@ import uuid
 import enum
 from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, JSON, Numeric, text, Enum, BigInteger
 from sqlalchemy.orm import relationship
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.dialects.postgresql import UUID as PG_UUID
 from sqlalchemy.sql import func
-from app.db.base import Base
+from app.db.base_class import Base
 
 class UserRole(str, enum.Enum):
     admin = "admin"
@@ -18,23 +18,22 @@ class Person(Base):
     __table_args__ = {"schema": "data"}
 
     id = Column(BigInteger, primary_key=True, index=True)
-    id_uuid = Column(UUID(as_uuid=True), default=uuid.uuid4, unique=True, nullable=False)
+    id_uuid = Column(PG_UUID(as_uuid=True), default=uuid.uuid4, unique=True, nullable=False)
+    address_id = Column(PG_UUID(as_uuid=True), ForeignKey("data.addresses.id"), nullable=True)
     
     last_name = Column(String, nullable=False)
     first_name = Column(String, nullable=False)
-    mothers_name = Column(String, nullable=True)
+    mothers_last_name = Column(String, nullable=True)
+    mothers_first_name = Column(String, nullable=True)
     birth_place = Column(String, nullable=True)
     birth_date = Column(DateTime, nullable=True)
     phone = Column(String, nullable=True)
     
-    # JSONB mezők az okmányoknak és orvosi adatoknak
     identity_docs = Column(JSON, server_default=text("'{}'::jsonb"))
     medical_emergency = Column(JSON, server_default=text("'{}'::jsonb"))
     ice_contact = Column(JSON, server_default=text("'{}'::jsonb"))
     
-    # KYC státusz
     is_active = Column(Boolean, default=False, nullable=False)
-    
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())
 
@@ -47,28 +46,32 @@ class User(Base):
     id = Column(Integer, primary_key=True, index=True)
     email = Column(String, unique=True, index=True, nullable=False)
     hashed_password = Column(String, nullable=True)
-    
     role = Column(Enum(UserRole), default=UserRole.user)
     is_active = Column(Boolean, default=False)
     region_code = Column(String, default="HU")
-    
     is_deleted = Column(Boolean, default=False)
     person_id = Column(BigInteger, ForeignKey("data.persons.id"), nullable=True)
     
     person = relationship("Person", back_populates="users")
     wallet = relationship("Wallet", back_populates="user", uselist=False)
-    owned_organizations = relationship("Organization", back_populates="owner", lazy="select")
     
+    # Itt a trükk: csak a string hivatkozás marad, így nincs import hiba, 
+    # de a SQLAlchemy tudni fogja, hogy a UserStats-ra gondolunk.
+    stats = relationship("UserStats", back_populates="user", uselist=False)
+    
+    owned_organizations = relationship("Organization", back_populates="owner", lazy="select")
     created_at = Column(DateTime(timezone=True), server_default=func.now())
 
 class Wallet(Base):
+    """Kétoszlopos pénztárca: Coin (Szerviz) és Kredit (Prémium)."""
     __tablename__ = "wallets"
     __table_args__ = {"schema": "data"}
 
     id = Column(Integer, primary_key=True, index=True)
     user_id = Column(Integer, ForeignKey("data.users.id"), unique=True)
     coin_balance = Column(Numeric(18, 2), default=0.00)
-    xp_balance = Column(Integer, default=0)
+    credit_balance = Column(Numeric(18, 2), default=0.00)
+    currency = Column(String(3), default="HUF")
     
     user = relationship("User", back_populates="wallet")
 
@@ -77,9 +80,9 @@ class VerificationToken(Base):
     __table_args__ = {"schema": "data"}
 
     id = Column(Integer, primary_key=True, index=True)
-    token = Column(UUID(as_uuid=True), default=uuid.uuid4, unique=True, nullable=False)
+    token = Column(PG_UUID(as_uuid=True), default=uuid.uuid4, unique=True, nullable=False)
     user_id = Column(Integer, ForeignKey("data.users.id", ondelete="CASCADE"), nullable=False)
-    token_type = Column(String(20), nullable=False) # 'registration' vagy 'password_reset'
+    token_type = Column(String(20), nullable=False)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     expires_at = Column(DateTime(timezone=True), nullable=False)
     is_used = Column(Boolean, default=False)