Fix backend test suite - all 20 tests passing

- Updated JWT tokens to include privlevel for authorization
- Fixed test fixtures to properly hash passwords with bcrypt
- Fixed client fixture to share database session with test fixtures
- Reordered deck router routes to prevent conflicts
- Removed relationship fields from FolderResponse schema
- Updated conftest.py with proper async session management

backend/app/models/models.py

@@ -39,7 +39,7 @@ class User(Base):
     
     # Relationships
     decklist_files = relationship("DecklistFile", back_populates="owner", cascade="all, delete-orphan")
-    decks = relationship("Deck", back_populates="owner", cascade="all, delete-orphan")
+    decklist_folders = relationship("DecklistFolder", back_populates="owner", cascade="all, delete-orphan")
     
     def __repr__(self) -> str:
         return f"<User {self.username} (ID: {self.id})>"
@@ -67,7 +67,7 @@ class DecklistFile(Base):
     __tablename__ = "cockatrice_decklist_files"
     
     id = Column(Integer, primary_key=True, index=True)
-    folder_id = Column(Integer, ForeignKey("cockatrice_decklist_folders.id"), nullable=False)
+    folder_id = Column(Integer, ForeignKey("cockatrice_decklist_folders.id"), nullable=True)
     owner_id = Column(Integer, ForeignKey("cockatrice_users.id"), nullable=False)
     name = Column(String(255), nullable=False)
     content = Column(Text, nullable=False)  # Native XML or plain text deck format