fix: handle invalid dimensions config and align get_dim return

- Add try-except around int() conversion in _embedding_kwargs to
  gracefully handle invalid embedding_dimensions config values
- Update get_dim() to return 0 when embedding_dimensions is not
  explicitly configured, so callers know dimensions weren't specified
  and can handle it accordingly
- Both methods now share consistent logic for reading the config

Signed-off-by: JiangNan <1394485448@qq.com>

astrbot/core/provider/sources/openai_embedding_source.py

@@ -62,12 +62,20 @@ class OpenAIEmbeddingProvider(EmbeddingProvider):
         """构建嵌入请求的可选参数"""
         kwargs = {}
         if "embedding_dimensions" in self.provider_config:
-            kwargs["dimensions"] = int(self.provider_config["embedding_dimensions"])
+            try:
+                kwargs["dimensions"] = int(self.provider_config["embedding_dimensions"])
+            except (ValueError, TypeError):
+                logger.warning(f"配置中的 embedding_dimensions 值无效: '{self.provider_config['embedding_dimensions']}'，已忽略。")
         return kwargs
 
     def get_dim(self) -> int:
         """获取向量的维度"""
-        return int(self.provider_config.get("embedding_dimensions", 1024))
+        if "embedding_dimensions" in self.provider_config:
+            try:
+                return int(self.provider_config["embedding_dimensions"])
+            except (ValueError, TypeError):
+                logger.warning(f"配置中的 embedding_dimensions 值无效: '{self.provider_config['embedding_dimensions']}'")
+        return 0
 
     async def terminate(self):
         if self.client: