Refactor samples gallery

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

backend/app/services/sample_manager.py

@@ -191,7 +191,7 @@ class SampleManager:
                 # Wait a bit before retrying on error
                 await asyncio.sleep(5)
 
-    async def list_samples(self, limit: int = 20, offset: int = 0) -> List[Sample]:
+    async def list_samples(self, limit: int = 200, offset: int = 0) -> List[Sample]:
         """List sample images with pagination"""
         logger.info(f"Total samples: {len(self.samples)}")
 
@@ -204,7 +204,7 @@ class SampleManager:
 
         return sorted_samples[offset:offset + limit]
 
-    async def get_latest_samples(self, count: int = 5) -> List[Sample]:
+    async def get_latest_samples(self, count: int = 20) -> List[Sample]:
         """Get most recent samples"""
         return await self.list_samples(limit=count, offset=0)