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/docs/MEMORY_SETTINGS_REVIEW.md

@@ -0,0 +1,39 @@
+# Memory Settings Review
+
+Use this when reviewing the Memory Settings search, filter, delete, and clear-all flow locally.
+
+## Quick Review
+
+1. Start DeerFlow locally.
+
+   ```bash
+   make dev
+   ```
+
+2. Load the sample memory fixture.
+
+   ```bash
+   python scripts/load_memory_sample.py
+   ```
+
+3. Open the app and review `Settings > Memory`.
+
+   Default local URLs:
+   - App: `http://localhost:2026`
+   - Local frontend-only fallback: `http://localhost:3000`
+
+## What To Check
+
+- Search `memory` and confirm multiple facts are matched.
+- Search `Chinese` and confirm text filtering works.
+- Search `workflow` and confirm category text is also searchable.
+- Switch between `All`, `Facts`, and `Summaries`.
+- Delete the disposable sample fact and confirm the list updates immediately.
+- Clear all memory and confirm the page enters the empty state.
+
+## Fixture Files
+
+- Sample fixture: `backend/docs/memory-settings-sample.json`
+- Default local runtime target: `backend/.deer-flow/memory.json`
+
+The loader script creates a timestamped backup automatically before overwriting an existing runtime memory file.