Add basic backend infrastructure

Signed-off-by: Felipe Cardoso <felipe.cardoso@hotmail.it>

backend/app/api/routes/samples.py

@@ -0,0 +1,34 @@
+from typing import List
+
+from fastapi import APIRouter, HTTPException, Query
+
+from app.models.sample import Sample
+from app.services.sample_manager import SampleManager
+
+router = APIRouter()
+sample_manager = SampleManager()
+
+
+@router.get("/list", response_model=List[Sample])
+async def list_samples(
+        limit: int = Query(20, ge=1, le=100),
+        offset: int = Query(0, ge=0)
+):
+    """
+    List sample images with pagination
+    """
+    try:
+        return await sample_manager.list_samples(limit, offset)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.get("/latest", response_model=List[Sample])
+async def get_latest_samples(count: int = Query(5, ge=1, le=20)):
+    """
+    Get the most recent sample images
+    """
+    try:
+        return await sample_manager.get_latest_samples(count)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))