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

app/api/endpoints/admin.py

@@ -0,0 +1,66 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_api_key
+from app.models.module import Module
+import secrets
+from pydantic import BaseModel
+from datetime import datetime
+
+router = APIRouter()
+
+class ModuleCreate(BaseModel):
+    name: str
+
+class ModuleResponse(BaseModel):
+    id: int
+    name: str
+    secret_key: str
+    is_active: bool
+
+    class Config:
+        from_attributes = True
+
+@router.post("/modules", response_model=ModuleResponse)
+def create_module(
+    module_in: ModuleCreate, 
+    db: Session = Depends(get_db),
+    api_key: str = Depends(get_api_key) # Only global admin key should be allowed here ideally
+):
+    # Check if exists
+    db_module = db.query(Module).filter(Module.name == module_in.name).first()
+    if db_module:
+        raise HTTPException(status_code=400, detail="Module already exists")
+    
+    new_key = secrets.token_hex(32)
+    db_module = Module(
+        name=module_in.name,
+        secret_key=new_key
+    )
+    db.add(db_module)
+    db.commit()
+    db.refresh(db_module)
+    return db_module
+
+@router.post("/modules/{module_id}/rotate", response_model=ModuleResponse)
+def rotate_module_key(
+    module_id: int,
+    db: Session = Depends(get_db),
+    api_key: str = Depends(get_api_key)
+):
+    db_module = db.query(Module).filter(Module.id == module_id).first()
+    if not db_module:
+        raise HTTPException(status_code=404, detail="Module not found")
+    
+    db_module.secret_key = secrets.token_hex(32)
+    db_module.last_rotated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(db_module)
+    return db_module
+
+@router.get("/modules", response_model=list[ModuleResponse])
+def get_modules(
+    db: Session = Depends(get_db),
+    api_key: str = Depends(get_api_key)
+):
+    return db.query(Module).all()