feat: 添加嵌入服务层和任务解析工具，重构文本嵌入逻辑

src/common/data_models/embedding_service_data_models.py

@@ -0,0 +1,19 @@
+"""Embedding 服务层共享数据模型。"""
+
+from dataclasses import dataclass, field
+from typing import List
+
+from src.common.data_models import BaseDataModel
+
+
+@dataclass(slots=True)
+class EmbeddingResult(BaseDataModel):
+    """Embedding 服务层统一响应对象。"""
+
+    embedding: List[float] = field(default_factory=list)
+    model_name: str = field(default_factory=str)
+
+
+__all__ = [
+    "EmbeddingResult",
+]