feat: add template upload endpoint

backend/app/services/template_service.py

@@ -1,15 +1,24 @@
 """模板相关业务逻辑"""
+from datetime import datetime
+from pathlib import Path
+from uuid import uuid4
+
 from fastapi import UploadFile
 from sqlalchemy.orm import Session
 from ..models.template import Template
+from .storage import upload_file
 
 
 ALLOWED_EXTENSIONS = {".docx"}
 MAX_FILE_SIZE = 50 * 1024 * 1024  # 50MB
+TEMPLATE_BUCKET = "templates"
 
 
 def validate_file(file: UploadFile):
     """校验文件格式和大小"""
+    if not file.filename:
+        raise ValueError("文件名不能为空")
+
     ext = "." + file.filename.rsplit(".", 1)[-1].lower() if "." in file.filename else ""
     if ext not in ALLOWED_EXTENSIONS:
         raise ValueError(f"不支持的文件格式: {ext}，仅支持 .docx")
@@ -21,6 +30,21 @@ def validate_file(file: UploadFile):
     return content
 
 
+def build_template_file_path(filename: str) -> str:
+    """生成模板文件存储路径。"""
+    suffix = Path(filename).suffix.lower()
+    today = datetime.now().strftime("%Y%m%d")
+    return f"{today}/{uuid4().hex}{suffix}"
+
+
+def store_template_file(file: UploadFile) -> tuple[str, bytes]:
+    """校验并保存上传的模板文件，返回存储路径和文件内容。"""
+    content = validate_file(file)
+    file_path = build_template_file_path(file.filename or "template.docx")
+    stored_path = upload_file(TEMPLATE_BUCKET, file_path, content)
+    return stored_path, content
+
+
 def create_template_record(db: Session, name: str, file_path: str, type: str = "report") -> Template:
     """创建模板记录"""
     tmpl = Template(name=name, type=type, original_file_path=file_path)