feat(recipe-scanner): add version index fallback for LoRA enrichment

Add _get_lora_from_version_index method to fetch cached LoRA entries by modelVersionId when hash is unavailable. This improves LoRA enrichment by using version index as fallback when hash is missing, ensuring proper library status, file paths, and preview URLs are set even without hash values.

Update test suite to include version_index in stub cache and add test coverage for version-based lookup functionality.

tests/services/test_recipe_scanner.py

@@ -24,7 +24,7 @@ class StubLoraScanner:
         self._hash_index = StubHashIndex()
         self._hash_meta: dict[str, dict[str, str]] = {}
         self._models_by_name: dict[str, dict] = {}
-        self._cache = SimpleNamespace(raw_data=[])
+        self._cache = SimpleNamespace(raw_data=[], version_index={})
 
     async def get_cached_data(self):
         return self._cache
@@ -46,12 +46,20 @@ class StubLoraScanner:
     def register_model(self, name: str, info: dict) -> None:
         self._models_by_name[name] = info
         hash_value = (info.get("sha256") or "").lower()
+        version_id = info.get("civitai", {}).get("id")
         if hash_value:
             self._hash_meta[hash_value] = {
                 "path": info.get("file_path", ""),
                 "preview_url": info.get("preview_url", ""),
             }
             self._hash_index._hash_to_path[hash_value] = info.get("file_path", "")
+        if version_id is not None:
+            self._cache.version_index[int(version_id)] = {
+                "file_path": info.get("file_path", ""),
+                "sha256": hash_value,
+                "preview_url": info.get("preview_url", ""),
+                "civitai": info.get("civitai", {}),
+            }
         self._cache.raw_data.append({
             "sha256": info.get("sha256", ""),
             "path": info.get("file_path", ""),
@@ -216,3 +224,26 @@ async def test_load_recipe_rewrites_missing_image_path(tmp_path: Path, recipe_sc
 
     persisted = json.loads(recipe_path.read_text())
     assert persisted["file_path"] == expected_path
+
+
+def test_enrich_uses_version_index_when_hash_missing(recipe_scanner):
+    scanner, stub = recipe_scanner
+    version_id = 77
+    file_path = str(Path(config.loras_roots[0]) / "loras" / "version-entry.safetensors")
+    registered = {
+        "sha256": "deadbeef",
+        "file_path": file_path,
+        "preview_url": "preview-from-cache.png",
+        "civitai": {"id": version_id},
+    }
+    stub.register_model("version-entry", registered)
+
+    lora = {"hash": "", "file_name": "", "modelVersionId": version_id, "strength": 0.5}
+
+    enriched = scanner._enrich_lora_entry(dict(lora))
+
+    assert enriched["inLibrary"] is True
+    assert enriched["hash"] == registered["sha256"]
+    assert enriched["localPath"] == file_path
+    assert enriched["file_name"] == Path(file_path).stem
+    assert enriched["preview_url"] == registered["preview_url"]