Fix: numeric string miss transformation. (#11025)

### What problem does this PR solve?

#11024

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/db/services/dialog_service.py

@@ -294,6 +294,7 @@ def meta_filter(metas: dict, filters: list[dict]):
     def filter_out(v2docs, operator, value):
         ids = []
         for input, docids in v2docs.items():
+            if operator in ["=", "≠", ">", "<", "≥", "≤"]:
                 try:
                     input = float(input)
                     value = float(value)