refactor(annotation): 移除文本内容获取相关功能

- 删除了 fetch_text_content_via_download_api 导入
- 移除了 TEXT 类型数据集的文本内容获取逻辑
- 删除了 _append_annotation_to_content 方法实现
- 简化了知识同步服务的内容处理流程

runtime/datamate-python/app/module/annotation/service/knowledge_sync.py

@@ -11,7 +11,6 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.core.config import settings
 from app.core.logging import get_logger
 from app.db.models import Dataset, DatasetFiles, LabelingProject
-from app.module.annotation.service.text_fetcher import fetch_text_content_via_download_api
 
 logger = get_logger(__name__)
 
@@ -254,16 +253,6 @@ class KnowledgeSyncService:
             content_type = "MARKDOWN"
 
         content = annotation_json
-        if dataset_type == "TEXT":
-            try:
-                content = await fetch_text_content_via_download_api(
-                    project.dataset_id,
-                    str(file_record.id),
-                )
-                content = self._append_annotation_to_content(content, annotation_json, content_type)
-            except Exception as exc:
-                logger.warning("读取文本失败，改为仅存标注JSON：%s", exc)
-                content = annotation_json
 
         payload: Dict[str, Any] = {
             "title": title,
@@ -294,13 +283,6 @@ class KnowledgeSyncService:
             extension = file_type
         return extension.lower() in {"md", "markdown"}
 
-    def _append_annotation_to_content(self, content: str, annotation_json: str, content_type: str) -> str:
-        if content_type == "MARKDOWN":
-            return (
-                f"{content}\n\n---\n\n## 标注结果\n\n```json\n"
-                f"{annotation_json}\n```")
-        return f"{content}\n\n---\n\n标注结果(JSON):\n{annotation_json}"
-
     def _strip_extension(self, file_name: str) -> str:
         if not file_name:
             return ""