prepare fastapi root layout for server deployment

app/schemas/imports.py

@@ -0,0 +1,36 @@
+from pydantic import BaseModel, Field
+
+
+class CaseSqlPreviewCase(BaseModel):
+    """病例 SQL 预览病例：展示导入文件中识别到的病例摘要。"""
+
+    id: int
+    title: str
+    case_type: str
+    difficulty: str
+
+
+class CaseSqlImportPreviewResponse(BaseModel):
+    """病例 SQL 预检响应：只展示解析结果，不写入数据库。"""
+
+    file_name: str
+    encoding: str | None = None
+    tables: dict[str, int] = Field(default_factory=dict)
+    can_import: bool = False
+    warnings: list[str] = Field(default_factory=list)
+    errors: list[str] = Field(default_factory=list)
+    preview_cases: list[CaseSqlPreviewCase] = Field(default_factory=list)
+
+
+class CaseSqlImportApplyResponse(BaseModel):
+    """病例 SQL 导入响应：展示实际写库结果。"""
+
+    imported: bool
+    file_name: str
+    encoding: str
+    inserted_or_updated_cases: int
+    imported_traditional_cases: int
+    imported_teaching_cases: int
+    imported_scoring_rules: int
+    generated_exam_items: int
+    warnings: list[str] = Field(default_factory=list)