Complete backend infrastructure and authentication system

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

backend/app/api/routes/vt.py

@@ -0,0 +1,40 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from pydantic import BaseModel
+from typing import Optional
+
+from app.core.database import get_db
+from app.core.deps import get_current_active_user
+from app.models.user import User
+
+router = APIRouter()
+
+
+class VTLookupRequest(BaseModel):
+    hash: str
+
+
+class VTLookupResponse(BaseModel):
+    hash: str
+    malicious: Optional[bool] = None
+    message: str
+
+
+@router.post("/lookup", response_model=VTLookupResponse)
+async def virustotal_lookup(
+    request: VTLookupRequest,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db)
+):
+    """
+    Lookup hash in VirusTotal
+    
+    Requires authentication. In a real implementation, this would call
+    the VirusTotal API.
+    """
+    # Placeholder implementation
+    return {
+        "hash": request.hash,
+        "malicious": None,
+        "message": "VirusTotal integration not yet implemented"
+    }