feat: enrich list API responses with CivitAI stats from local DB

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

tests/test_proxy_enrichment.py

@@ -0,0 +1,41 @@
+"""Tests for proxy response enrichment with stats."""
+import pytest
+
+
+@pytest.fixture
+def db(tmp_path):
+    from stats_db import StatsDB
+    db = StatsDB(tmp_path / "test.db")
+    db.init()
+    return db
+
+
+def test_enrich_list_response(db):
+    """Stats are merged into list response items."""
+    from proxy import _enrich_list_response
+
+    db.upsert("hash_a", {"download_count": 5000, "rating": 4.8,
+                          "rating_count": 120, "thumbs_up_count": 89})
+
+    response_data = {
+        "items": [
+            {"sha256": "hash_a", "file_name": "lora_a.safetensors"},
+            {"sha256": "hash_b", "file_name": "lora_b.safetensors"},
+        ],
+        "total": 2,
+    }
+
+    enriched = _enrich_list_response(response_data, db)
+    assert enriched["items"][0]["download_count"] == 5000
+    assert enriched["items"][0]["rating"] == 4.8
+    assert enriched["items"][0]["thumbs_up_count"] == 89
+    # Item without stats gets no extra fields
+    assert "download_count" not in enriched["items"][1]
+
+
+def test_enrich_empty_items(db):
+    """Empty items list returns unchanged."""
+    from proxy import _enrich_list_response
+    response_data = {"items": [], "total": 0}
+    enriched = _enrich_list_response(response_data, db)
+    assert enriched["items"] == []