feat(annotation): 实现任务列表分页加载和优化排序功能

- 添加分页相关字段到EditorTaskListResponse类型定义
- 定义TASK_PAGE_START和TASK_PAGE_SIZE常量及NormalizedTaskList类型
- 实现mergeTaskItems、mergeTaskPages和normalizeTaskListResponse工具函数
- 添加taskPage、taskTotal、taskTotalPages和loadingMore状态管理
- 优化后端查询逻辑，使用case语句实现标注状态排序
- 集成外连接查询同时获取文件信息和标注结果
- 改进前端任务列表的数据合并和分页加载机制

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

@@ -18,7 +18,7 @@ import hashlib
 import json
 import xml.etree.ElementTree as ET
 from fastapi import HTTPException
-from sqlalchemy import func, select
+from sqlalchemy import case, func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.config import settings
@@ -420,38 +420,34 @@ class AnnotationEditorService:
         )
         total = int(count_result.scalar() or 0)
 
+        annotated_sort_key = case(
+            (AnnotationResult.id.isnot(None), 1),
+            else_=0,
+        )
         files_result = await self.db.execute(
-            select(DatasetFiles)
+            select(DatasetFiles, AnnotationResult.id, AnnotationResult.updated_at)
+            .outerjoin(
+                AnnotationResult,
+                (AnnotationResult.file_id == DatasetFiles.id)
+                & (AnnotationResult.project_id == project_id),
+            )
             .where(DatasetFiles.dataset_id == project.dataset_id)
-            .order_by(DatasetFiles.created_at.desc())
+            .order_by(annotated_sort_key.asc(), DatasetFiles.created_at.desc())
             .offset(page * size)
             .limit(size)
         )
-        files = files_result.scalars().all()
-
-        file_ids = [str(f.id) for f in files]  # type: ignore[arg-type]
-        updated_map: Dict[str, datetime] = {}
-        if file_ids:
-            ann_result = await self.db.execute(
-                select(AnnotationResult.file_id, AnnotationResult.updated_at).where(
-                    AnnotationResult.project_id == project_id,
-                    AnnotationResult.file_id.in_(file_ids),
-                )
-            )
-            for file_id, updated_at in ann_result.all():
-                if file_id and updated_at:
-                    updated_map[str(file_id)] = updated_at
+        rows = files_result.all()
 
         items: List[EditorTaskListItem] = []
-        for f in files:
-            fid = str(f.id)  # type: ignore[arg-type]
+        for file_record, annotation_id, annotation_updated_at in rows:
+            fid = str(file_record.id)  # type: ignore[arg-type]
             items.append(
                 EditorTaskListItem(
                     fileId=fid,
-                    fileName=str(getattr(f, "file_name", "")),
-                    fileType=getattr(f, "file_type", None),
-                    hasAnnotation=fid in updated_map,
-                    annotationUpdatedAt=updated_map.get(fid),
+                    fileName=str(getattr(file_record, "file_name", "")),
+                    fileType=getattr(file_record, "file_type", None),
+                    hasAnnotation=annotation_id is not None,
+                    annotationUpdatedAt=annotation_updated_at,
                 )
             )