feat(api): folder_indexer.summarize_image via gpt-4o-mini vision

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_folder_indexer.py

@@ -5,7 +5,7 @@ from unittest.mock import AsyncMock, patch
 
 import pytest
 
-from app.core.folder_indexer import summarize_text, IndexResult
+from app.core.folder_indexer import summarize_text, summarize_image, IndexResult
 
 pytestmark = pytest.mark.asyncio
 
@@ -28,3 +28,26 @@ async def test_summarize_text_truncates_summary_at_500_chars():
     with patch("app.core.folder_indexer._llm_text", new=AsyncMock(return_value=mock_resp)):
         result = await summarize_text(content="x", ext=".md", name="x.md")
     assert len(result.summary) <= 500
+
+
+async def test_summarize_image_uses_vision_content_blocks():
+    mock_resp = AsyncMock()
+    mock_resp.content = "Final logo on white background."
+    mock_resp.usage_metadata = {"total_tokens": 500}
+    captured = {}
+
+    async def fake_llm_vision(messages):
+        captured["messages"] = messages
+        return mock_resp
+
+    with patch("app.core.folder_indexer._llm_vision", new=fake_llm_vision):
+        result = await summarize_image(image_b64="iVBORw0KG", mime="image/png")
+
+    assert "Final logo" in result.summary
+    assert result.tokens_used == 500
+    # last message contains an image content block
+    last = captured["messages"][-1]
+    assert any(
+        isinstance(p, dict) and p.get("type") == "image_url"
+        for p in (last.content if isinstance(last.content, list) else [])
+    )