Add Macavity/siyuan-rag-assistant (#1658)

Author: Macavity

plugins.json

@@ -198,6 +198,7 @@
     "Achuan-2/siyuan-plugin-formatPainter",
     "Macavity/siyuan-database-properties-panel",
     "Macavity/siyuan-tasks",
+    "Macavity/siyuan-rag-assistant",
     "Achuan-2/siyuan-plugin-imgAddLink",
     "SteelDrEgg/siyuan-graph",
     "zt8989/siyuan-drawio-plugin",