fix: sync/barcode/memory overhaul + detailed logs + preview + result tracking

- Sync: fix GiteaSync constructor + add push()/pull() methods
- Barcode: two-tab layout matching GUI (mapping + special rules)
- Memory: spec→specification unification, manual add, confidence/price tracking
- Processing: TaskLogHandler captures detailed logs (barcode mapping, unit conversion)
- Preview: fullscreen dialog for file preview (image/Excel) in Orders/Tables/Images
- Detail: per-file log filtering in file pages
- Tasks: result files now per-task, add copy path button
- Config: reactive edited state + save_config fix
- Dashboard: sync task isolation, log limit 10

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/backend/routers/files.py

@@ -7,7 +7,7 @@ from pathlib import Path
 from typing import List, Optional
 
 from fastapi import APIRouter, HTTPException, UploadFile, File, Depends, Query, Request
-from fastapi.responses import FileResponse
+from fastapi.responses import FileResponse, JSONResponse
 from pydantic import BaseModel
 
 from ..auth.dependencies import get_current_user, get_current_user_flexible
@@ -267,10 +267,13 @@ async def get_file_relations(
     status: Optional[str] = None,
     page: int = Query(1, ge=1),
     page_size: int = Query(50, ge=1, le=200),
+    sort_by: Optional[str] = None,
+    sort_order: str = "desc",
     current_user: dict = Depends(get_current_user),
 ):
     """Query file relations with optional view filter."""
-    items, total = query_file_relations(view=view, status=status, page=page, page_size=page_size)
+    items, total = query_file_relations(view=view, status=status, page=page, page_size=page_size,
+                                        sort_by=sort_by, sort_order=sort_order)
     return {"items": items, "total": total}
 
 
@@ -299,3 +302,47 @@ async def delete_relations(
     """Delete file relation records by IDs."""
     delete_file_relations(body.ids)
     return {"message": f"已删除 {len(body.ids)} 条关系记录"}
+
+
+# ---------------------------------------------------------------------------
+# File preview
+# ---------------------------------------------------------------------------
+
+@router.get("/preview/{directory}/{filename:path}")
+async def preview_file(
+    directory: str,
+    filename: str,
+    current_user: dict = Depends(get_current_user),
+):
+    """Preview file content: images served directly, Excel returned as JSON grid."""
+    # Security: only allow specific directories
+    if directory not in ("input", "output", "result"):
+        raise HTTPException(403, "不允许访问该目录")
+
+    dir_map = {"input": _input_dir, "output": _output_dir, "result": _result_dir}
+    file_path = dir_map[directory] / filename
+    if not file_path.is_file():
+        raise HTTPException(404, f"文件不存在: {filename}")
+
+    ext = file_path.suffix.lower()
+    # Images: serve directly
+    if ext in ('.jpg', '.jpeg', '.png', '.bmp', '.gif', '.webp'):
+        return FileResponse(str(file_path))
+
+    # Excel: read and return as JSON grid
+    if ext in ('.xls', '.xlsx'):
+        try:
+            import pandas as pd
+            from fastapi.responses import JSONResponse
+            df = pd.read_excel(str(file_path), header=None)
+            # Fill NaN with empty string
+            df = df.fillna('')
+            rows = []
+            for _, row in df.iterrows():
+                rows.append([str(v) if v != '' else '' for v in row])
+            # Limit to first 200 rows
+            return JSONResponse({"type": "excel", "rows": rows[:200], "total_rows": len(rows)})
+        except Exception as e:
+            raise HTTPException(500, f"读取文件失败: {e}")
+
+    raise HTTPException(400, f"不支持预览的文件类型: {ext}")