feat(backend): 更新核心模块和文件处理

- 更新配置模块 (config.py)
- 更新数据库连接 (database.py)
- 更新主应用入口 (main.py)
- 更新数据模型 (models.py)
- 更新基础 Schema (base.py)
- 更新文件处理器 (docx, excel, pdf)
- 更新 Dockerfile

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/services/file_processor/excel_processor.py

@@ -1,8 +1,9 @@
 """
 Excel/CSV Text Extractor
 """
-import pandas as pd
+import asyncio
 from typing import Dict, List
+import pandas as pd
 
 
 class ExcelProcessor:
@@ -13,6 +14,12 @@ class ExcelProcessor:
         df = pd.read_csv(file_path)
         return self._dataframe_to_text(df)
 
+    async def extract_csv_async(self, file_path: str) -> str:
+        """Extract CSV asynchronously"""
+        return await asyncio.get_event_loop().run_in_executor(
+            None, self.extract_csv, file_path
+        )
+
     def extract_excel(self, file_path: str, sheet_name: str = None) -> str:
         """Extract text from Excel file"""
         if sheet_name:
@@ -27,6 +34,12 @@ class ExcelProcessor:
                 text_parts.append(self._dataframe_to_text(df))
             return "\n\n".join(text_parts)
 
+    async def extract_excel_async(self, file_path: str, sheet_name: str = None) -> str:
+        """Extract Excel asynchronously"""
+        return await asyncio.get_event_loop().run_in_executor(
+            None, self.extract_excel, file_path, sheet_name
+        )
+
     def _dataframe_to_text(self, df: pd.DataFrame) -> str:
         """Convert DataFrame to readable text"""
         text_parts = []
@@ -48,19 +61,25 @@ class ExcelProcessor:
         sheets = pd.read_excel(file_path, sheet_name=None)
         return {name: self._dataframe_to_text(df) for name, df in sheets.items()}
 
+    async def extract_all_sheets_async(self, file_path: str) -> Dict[str, str]:
+        """Extract all sheets asynchronously"""
+        return await asyncio.get_event_loop().run_in_executor(
+            None, self.extract_all_sheets, file_path
+        )
+
     def get_sheet_names(self, file_path: str) -> List[str]:
         """Get all sheet names from Excel file"""
         xl = pd.ExcelFile(file_path)
         return xl.sheet_names
 
 
-def process_csv(file_path: str) -> str:
+async def process_csv(file_path: str) -> str:
     """Process CSV file and return text"""
     processor = ExcelProcessor()
-    return processor.extract_csv(file_path)
+    return await processor.extract_csv_async(file_path)
 
 
-def process_excel(file_path: str) -> str:
+async def process_excel(file_path: str) -> str:
     """Process Excel file and return text"""
     processor = ExcelProcessor()
-    return processor.extract_excel(file_path)
+    return await processor.extract_excel_async(file_path)