Complete backend infrastructure and authentication system

Co-authored-by: mblanke <9078342+mblanke@users.noreply.github.com>

backend/app/models/case.py

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+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Text
+from sqlalchemy.orm import relationship
+from datetime import datetime
+
+from app.core.database import Base
+
+
+class Case(Base):
+    __tablename__ = "cases"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, nullable=False)
+    description = Column(Text, nullable=True)
+    status = Column(String, default="open", nullable=False)  # open, closed, investigating
+    severity = Column(String, nullable=True)  # low, medium, high, critical
+    tenant_id = Column(Integer, ForeignKey("tenants.id"), nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    tenant = relationship("Tenant", back_populates="cases")
+    artifacts = relationship("Artifact", back_populates="case")