feat: Initialize FastAPI AI Gateway project structure with authentication, module management, and LLM API routing.

app/models/__init__.py

@@ -0,0 +1 @@
+from app.models.module import Module

app/models/module.py

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+from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from datetime import datetime
+from app.core.database import Base
+
+class Module(Base):
+    __tablename__ = "modules"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, unique=True, index=True)
+    secret_key = Column(String, unique=True, index=True)
+    program = Column(String, nullable=True)
+    lob = Column(String, nullable=True)
+    job_code = Column(String, nullable=True)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    last_rotated_at = Column(DateTime, default=datetime.utcnow)