Feat: Enable image edit in edit_chunk (#11971)

### What problem does this PR solve?

Feat: Enable image edit in edit_chunk

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/chunk_app.py

@@ -17,7 +17,7 @@ import asyncio
 import datetime
 import json
 import re
-
+import base64
 import xxhash
 from quart import request
 
@@ -174,6 +174,12 @@ async def set():
             v = 0.1 * v[0] + 0.9 * v[1] if doc.parser_id != ParserType.QA else v[1]
             _d["q_%d_vec" % len(v)] = v.tolist()
             settings.docStoreConn.update({"id": req["chunk_id"]}, _d, search.index_name(tenant_id), doc.kb_id)
+
+            # update image
+            image_base64 = req.get("image_base64", None)
+            if image_base64:
+                image_binary = base64.b64decode(image_base64)
+                settings.STORAGE_IMPL.put(req["doc_id"], req["chunk_id"], image_binary)
             return get_json_result(data=True)
 
         return await asyncio.to_thread(_set_sync)