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

app/api/endpoints/auth.py

@@ -0,0 +1,26 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from app.core import security
+from app.core.config import settings
+from pydantic import BaseModel
+
+router = APIRouter()
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+@router.post("/login", response_model=Token)
+async def login(form_data: OAuth2PasswordRequestForm = Depends()):
+    # Simple admin check - in a real app, query a User table
+    if form_data.username == "admin" and form_data.password == settings.ADMIN_PASSWORD:
+        access_token = security.create_access_token(
+            data={"sub": form_data.username}
+        )
+        return {"access_token": access_token, "token_type": "bearer"}
+    
+    raise HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Incorrect username or password",
+        headers={"WWW-Authenticate": "Bearer"},
+    )