Refactor: Auth & Identity System v1.4

- Fix: Resolved SQLAlchemy Mapper error for 'UserVehicle' using string-based relationships.
- Fix: Fixed Postgres Enum case sensitivity issue for 'userrole' (forcing lowercase 'user').
- Fix: Resolved ImportError for 'create_access_token' in security module.
- Feature: Implemented 2-step registration protocol (Lite Register -> KYC Step).
- Data: Added bank-level KYC fields (mother's name, ID/Driver/Boat/Pilot license expiry and categories).
- Business: Applied private fleet isolation (is_transferable=False for individual orgs).
- Docs: Updated Grand Master Book to v1.4 and added Developer Pitfalls guide.

backend/app/models/identity.py

@@ -11,6 +11,7 @@ class UserRole(str, enum.Enum):
     USER = "user"
     SERVICE = "service"
     FLEET_MANAGER = "fleet_manager"
+    DRIVER = "driver"
 
 class Person(Base):
     __tablename__ = "persons"
@@ -25,6 +26,7 @@ class Person(Base):
     birth_place = Column(String, nullable=True)
     birth_date = Column(DateTime, nullable=True)
     
+    # KYC Okmányok és Safety adatok
     identity_docs = Column(JSON, server_default=text("'{}'::jsonb"))
     medical_emergency = Column(JSON, server_default=text("'{}'::jsonb"))
     ice_contact = Column(JSON, server_default=text("'{}'::jsonb"))
@@ -37,26 +39,26 @@ 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=False)
+    hashed_password = Column(String, nullable=True) # Social Auth esetén null lehet!
+    
+    # Social Auth mezők
+    social_provider = Column(String, nullable=True) # google, facebook
+    social_id = Column(String, nullable=True)
     
     role = Column(Enum(UserRole), default=UserRole.USER)
     is_active = Column(Boolean, default=True)
-    is_superuser = Column(Boolean, default=False)
-    is_company = Column(Boolean, default=False)
-    company_name = Column(String, nullable=True)
-    tax_number = Column(String, nullable=True)
     region_code = Column(String, default="HU")
     
+    # Soft Delete
     is_deleted = Column(Boolean, default=False)
     deleted_at = Column(DateTime, nullable=True)
-    created_at = Column(DateTime(timezone=True), server_default=func.now())
-    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
     
     person_id = Column(Integer, ForeignKey("data.persons.id"), nullable=True)
-    
     person = relationship("Person", back_populates="users")
     wallet = relationship("Wallet", back_populates="user", uselist=False)
-    owned_organizations = relationship("Organization", backref="owner")
+    owned_organizations = relationship("Organization", back_populates="owner")
+    
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
 
 class Wallet(Base):
     __tablename__ = "wallets"