fix(runs): restore historical runs from persistent store after gateway restart (#2989)

* fix(runs): restore historical runs from persistent store after gateway restart

  RunManager.list_by_thread() and get() only queried the in-memory _runs
  dict, returning empty results after a restart even when PostgreSQL had
  the records. Add store fallback to both read paths and a new async
  aget() for the API endpoint, keeping sync get() for internal callers
  that need live task/abort_event state.

    Fixes #2984

* Apply suggestions from code review

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* fix(runs): scope run store fallback reads by user id

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Co-authored-by: WillemJiang <219644+WillemJiang@users.noreply.github.com>

* test(runs): clarify ordering expectation and mock store filters

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Co-authored-by: WillemJiang <219644+WillemJiang@users.noreply.github.com>

* test(runs): make user filter fallback assertions explicit

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* test(runs): verify user-isolated fallback behavior with memory store

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* update the code with feedback from issue-2984

---------

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backend/packages/harness/deerflow/runtime/runs/store/base.py

@@ -34,7 +34,12 @@ class RunStore(abc.ABC):
         pass
 
     @abc.abstractmethod
-    async def get(self, run_id: str) -> dict[str, Any] | None:
+    async def get(
+        self,
+        run_id: str,
+        *,
+        user_id: str | None = None,
+    ) -> dict[str, Any] | None:
         pass
 
     @abc.abstractmethod

backend/packages/harness/deerflow/runtime/runs/store/memory.py

@@ -46,8 +46,13 @@ class MemoryRunStore(RunStore):
             "updated_at": now,
         }
 
-    async def get(self, run_id):
-        return self._runs.get(run_id)
+    async def get(self, run_id, *, user_id=None):
+        run = self._runs.get(run_id)
+        if run is None:
+            return None
+        if user_id is not None and run.get("user_id") != user_id:
+            return None
+        return run
 
     async def list_by_thread(self, thread_id, *, user_id=None, limit=100):
         results = [r for r in self._runs.values() if r["thread_id"] == thread_id and (user_id is None or r.get("user_id") == user_id)]