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/schemas/__init__.py

@@ -1,3 +1,89 @@
 """
 Pydantic Schemas
 """
+from app.schemas.base import (
+    TimestampMixin,
+    UUIDMixin,
+)
+
+from app.schemas.project import (
+    ProjectBase,
+    ProjectCreate,
+    ProjectUpdate,
+    ProjectResponse,
+)
+
+from app.schemas.file import (
+    FileBase,
+    FileCreate,
+    FileUpdate,
+    FileResponse,
+)
+
+from app.schemas.chunk import (
+    ChunkBase,
+    ChunkCreate,
+    ChunkUpdate,
+    ChunkResponse,
+)
+
+from app.schemas.question import (
+    QuestionBase,
+    QuestionCreate,
+    QuestionUpdate,
+    QuestionResponse,
+)
+
+from app.schemas.dataset import (
+    DatasetBase,
+    DatasetCreate,
+    DatasetUpdate,
+    DatasetResponse,
+)
+
+from app.schemas.eval import (
+    EvalDatasetBase,
+    EvalDatasetCreate,
+    EvalDatasetUpdate,
+    EvalDatasetResponse,
+    TaskBase,
+    TaskResponse,
+)
+
+__all__ = [
+    # Base
+    "TimestampMixin",
+    "UUIDMixin",
+    # Project
+    "ProjectBase",
+    "ProjectCreate",
+    "ProjectUpdate",
+    "ProjectResponse",
+    # File
+    "FileBase",
+    "FileCreate",
+    "FileUpdate",
+    "FileResponse",
+    # Chunk
+    "ChunkBase",
+    "ChunkCreate",
+    "ChunkUpdate",
+    "ChunkResponse",
+    # Question
+    "QuestionBase",
+    "QuestionCreate",
+    "QuestionUpdate",
+    "QuestionResponse",
+    # Dataset
+    "DatasetBase",
+    "DatasetCreate",
+    "DatasetUpdate",
+    "DatasetResponse",
+    # Eval
+    "EvalDatasetBase",
+    "EvalDatasetCreate",
+    "EvalDatasetUpdate",
+    "EvalDatasetResponse",
+    "TaskBase",
+    "TaskResponse",
+]