032: fix missing await on async SupersetClient calls in resource_service.py

Found 3 missing 'await' keywords causing 'coroutine object is not iterable':
  - get_dashboards_summary()  (line 57)
  - get_dashboards_summary_page() (line 114)
  - get_datasets_summary() (line 306)

All three were calling async methods in sync context — returned coroutine
objects instead of lists/dicts, causing iteration failures.

backend/src/services/resource_service.py

@@ -54,7 +54,7 @@ class ResourceService:
     ) -> list[dict[str, Any]]:
         with belief_scope("get_dashboards_with_status", f"env={env.id}"):
             client = SupersetClient(env)
-            dashboards = client.get_dashboards_summary(require_slug=require_slug)
+            dashboards = await client.get_dashboards_summary(require_slug=require_slug)
 
             # Enhance each dashboard with Git status and task status
             result = []
@@ -111,7 +111,7 @@ class ResourceService:
             f"env={env.id}, page={page}, page_size={page_size}, search={search}",
         ):
             client = SupersetClient(env)
-            total, dashboards_page = client.get_dashboards_summary_page(
+            total, dashboards_page = await client.get_dashboards_summary_page(
                 page=page,
                 page_size=page_size,
                 search=search,
@@ -303,7 +303,7 @@ class ResourceService:
     ) -> list[dict[str, Any]]:
         with belief_scope("get_datasets_with_status", f"env={env.id}"):
             client = SupersetClient(env)
-            datasets = client.get_datasets_summary()
+            datasets = await client.get_datasets_summary()
 
             # Enhance each dataset with task status and linked dashboard count
             sem = asyncio.Semaphore(3)  # limit concurrent Superset calls