feat: add memory management actions and local filters in memory settings (#1467)

* Add MVP memory management actions

* Fix memory settings locale coverage

* Polish memory management interactions

* Add memory search and type filters

* Refine memory settings review feedback

* docs: simplify memory settings review setup

* fix: restore memory updater compatibility helpers

* fix: address memory settings review feedback

* docs: soften memory sample review wording

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
Co-authored-by: JeffJiang <for-eleven@hotmail.com>

backend/app/gateway/routers/memory.py

@@ -1,9 +1,14 @@
 """Memory API router for retrieving and managing global memory data."""
 
-from fastapi import APIRouter
+from fastapi import APIRouter, HTTPException
 from pydantic import BaseModel, Field
 
-from deerflow.agents.memory.updater import get_memory_data, reload_memory_data
+from deerflow.agents.memory.updater import (
+    clear_memory_data,
+    delete_memory_fact,
+    get_memory_data,
+    reload_memory_data,
+)
 from deerflow.config.memory_config import get_memory_config
 
 router = APIRouter(prefix="/api", tags=["memory"])
@@ -135,6 +140,40 @@ async def reload_memory() -> MemoryResponse:
     return MemoryResponse(**memory_data)
 
 
+@router.delete(
+    "/memory",
+    response_model=MemoryResponse,
+    summary="Clear All Memory Data",
+    description="Delete all saved memory data and reset the memory structure to an empty state.",
+)
+async def clear_memory() -> MemoryResponse:
+    """Clear all persisted memory data."""
+    try:
+        memory_data = clear_memory_data()
+    except OSError as exc:
+        raise HTTPException(status_code=500, detail="Failed to clear memory data.") from exc
+
+    return MemoryResponse(**memory_data)
+
+
+@router.delete(
+    "/memory/facts/{fact_id}",
+    response_model=MemoryResponse,
+    summary="Delete Memory Fact",
+    description="Delete a single saved memory fact by its fact id.",
+)
+async def delete_memory_fact_endpoint(fact_id: str) -> MemoryResponse:
+    """Delete a single fact from memory by fact id."""
+    try:
+        memory_data = delete_memory_fact(fact_id)
+    except KeyError as exc:
+        raise HTTPException(status_code=404, detail=f"Memory fact '{fact_id}' not found.") from exc
+    except OSError as exc:
+        raise HTTPException(status_code=500, detail="Failed to delete memory fact.") from exc
+
+    return MemoryResponse(**memory_data)
+
+
 @router.get(
     "/memory/config",
     response_model=MemoryConfigResponse,