feat: 新增归档中心页面并完善知识库与报销查询能力

新增前端归档中心视图及相关工具函数，扩充知识库文档分类和
提取器支持多种格式，增强编排器报销查询的多维度检索，优
化本体规则和用户代理审核消息，前端完善报销创建和审批详
情交互细节，补充单元测试覆盖。

server/src/app/services/knowledge_preview.py

@@ -16,6 +16,7 @@ from app.services.knowledge_document_extractors import (
 )
 from app.services.knowledge_file_utils import extract_extension, format_size
 
+
 def build_preview(
     entry: dict[str, Any],
     *,
@@ -52,7 +53,9 @@ def build_preview(
                 subtitle="当前格式暂不支持在线解析预览。",
                 stats=[
                     KnowledgePreviewStatRead(label="文件格式", value=extension.upper() or "FILE"),
-                    KnowledgePreviewStatRead(label="文件大小", value=format_size(entry["size_bytes"])),
+                    KnowledgePreviewStatRead(
+                        label="文件大小", value=format_size(entry["size_bytes"])
+                    ),
                     KnowledgePreviewStatRead(label="建议操作", value="下载后查看"),
                 ],
                 blocks=[
@@ -68,9 +71,8 @@ def build_preview(
         ],
     )
 
-def _build_text_preview_page(
-    entry: dict[str, Any], text: str
-) -> KnowledgePreviewPageRead:
+
+def _build_text_preview_page(entry: dict[str, Any], text: str) -> KnowledgePreviewPageRead:
     lines = [line.strip() for line in text.splitlines() if line.strip()]
     if not lines:
         lines = ["文件内容为空，或当前文档未提取到可展示文本。"]
@@ -92,10 +94,9 @@ def _build_text_preview_page(
         blocks=blocks,
     )
 
-def _build_xlsx_preview_pages(
-    entry: dict[str, Any], file_path
-) -> list[KnowledgePreviewPageRead]:
-    sheets = self._extract_xlsx_sheets(file_path)
+
+def _build_xlsx_preview_pages(entry: dict[str, Any], file_path) -> list[KnowledgePreviewPageRead]:
+    sheets = _extract_xlsx_sheets(file_path)
     if not sheets:
         sheets = [("Sheet 1", [["未提取到表格内容。"]])]
 
@@ -118,7 +119,9 @@ def _build_xlsx_preview_pages(
                 stats=[
                     KnowledgePreviewStatRead(label="工作表数量", value=str(sheet_count)),
                     KnowledgePreviewStatRead(label="预览行数", value=str(len(visible_rows))),
-                    KnowledgePreviewStatRead(label="文件大小", value=format_size(entry["size_bytes"])),
+                    KnowledgePreviewStatRead(
+                        label="文件大小", value=format_size(entry["size_bytes"])
+                    ),
                 ],
                 blocks=blocks,
             )
@@ -126,10 +129,9 @@ def _build_xlsx_preview_pages(
 
     return preview_pages
 
-def _build_pptx_preview_pages(
-    entry: dict[str, Any], file_path
-) -> list[KnowledgePreviewPageRead]:
-    slides = self._extract_pptx_slides(file_path)
+
+def _build_pptx_preview_pages(entry: dict[str, Any], file_path) -> list[KnowledgePreviewPageRead]:
+    slides = _extract_pptx_slides(file_path)
     if not slides:
         slides = [["未提取到幻灯片文本。"]]
 
@@ -154,4 +156,3 @@ def _build_pptx_preview_pages(
         )
 
     return pages
-