fix(service): enhance message filtering to drop empty chat messages while retaining tool requests

tests/unit/test_entrypoints/test_api/test_routes/test_memorize_route_validation.py

@@ -0,0 +1,32 @@
+"""Validation paths for ``POST /api/v1/memory/add`` request DTOs."""
+
+from __future__ import annotations
+
+from everos.entrypoints.api.routes.memorize import ContentItemDTO, MemorizeAddRequest
+
+
+def test_add_request_accepts_md_content_item() -> None:
+    req = MemorizeAddRequest.model_validate(
+        {
+            "session_id": "s_md",
+            "messages": [
+                {
+                    "sender_id": "u1",
+                    "role": "user",
+                    "timestamp": 1_700_000_000_000,
+                    "content": [
+                        {
+                            "type": "md",
+                            "text": "# Deploy\nUse nginx.",
+                            "name": "deploy.md",
+                        }
+                    ],
+                }
+            ],
+        }
+    )
+
+    content = req.messages[0].content
+    assert isinstance(content, list)
+    assert isinstance(content[0], ContentItemDTO)
+    assert content[0].type == "md"