fix: Fix QwenEmotion crash when json.loads returns string-valued emotion scores (#719)

* Initial plan

* Fix clamp_score to handle string emotion values from json.loads

* Add warning log for non-numeric emotion scores in clamp_score

* Raise ValueError on non-numeric emotion scores to abort TTS inference

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

indextts/infer_v2.py

@@ -763,6 +763,13 @@ class QwenEmotion:
         self.min_score = 0.0
 
     def clamp_score(self, value):
+        try:
+            value = float(value)
+        except (TypeError, ValueError) as exc:
+            raise ValueError(
+                f"QwenEmotion returned a non-numeric emotion score {value!r}. "
+                "Please retry the request."
+            ) from exc
         return max(self.min_score, min(self.max_score, value))
 
     def convert(self, content):