feat: 升级审计装饰器，支持自动抓取并记录 API 请求体作为变更明细

inventory-backend/app/utils/decorators.py

@@ -95,7 +95,45 @@ def audit_log(module: str, action: str = None, get_target_id_fn=None, get_target
     审计日志装饰器
     用法: @audit_log(module='inbound_buy', action='create')
           @audit_log(module='bom', action='update', get_target_id_fn=lambda: ..., get_details_fn=lambda req, resp: ...)
+    
+    升级特性：
+    - 自动捕获请求 Payload 作为变更明细
+    - 自动过滤过长的 Base64 图片数据
+    - 支持自定义 get_details_fn 覆盖默认行为
     """
+    # 需要过滤的图片字段
+    IMAGE_FIELDS = {'arrival_photo', 'product_photo', 'photo', 'image', 'signature', 'borrow_signature', 'return_signature'}
+
+    def _filter_payload(payload):
+        """过滤 Payload 中的大字段，防止数据库膨胀"""
+        if not payload or not isinstance(payload, dict):
+            return payload
+        filtered = {}
+        for key, value in payload.items():
+            if key.lower() in IMAGE_FIELDS and isinstance(value, str) and len(value) > 100:
+                filtered[key] = '[图片数据已省略]'
+            elif isinstance(value, dict):
+                filtered[key] = _filter_payload(value)
+            elif isinstance(value, list):
+                filtered[key] = [
+                    _filter_payload(item) if isinstance(item, dict) else item
+                    for item in value
+                ]
+            else:
+                filtered[key] = value
+        return filtered
+
+    def _get_payload():
+        """自动获取请求 Payload"""
+        # 尝试 JSON
+        payload = request.get_json(silent=True)
+        if payload:
+            return payload
+        # 尝试 Form Data
+        if request.form:
+            return request.form.to_dict()
+        return None
+
     def wrapper(fn):
         @wraps(fn)
         def decorator(*args, **kwargs):
@@ -120,6 +158,10 @@ def audit_log(module: str, action: str = None, get_target_id_fn=None, get_target
             if callable(action):
                 final_action = action()
 
+            # 预先获取 Payload（用于后续 details 记录）
+            raw_payload = _get_payload()
+            filtered_payload = _filter_payload(raw_payload) if raw_payload else None
+
             # 执行原函数
             response = fn(*args, **kwargs)
 
@@ -157,10 +199,14 @@ def audit_log(module: str, action: str = None, get_target_id_fn=None, get_target
                     # 获取 details
                     details = None
                     if get_details_fn:
+                        # 优先使用自定义差异对比函数
                         try:
                             details = get_details_fn(request, response)
                         except Exception:
                             pass
+                    elif filtered_payload:
+                        # 默认：记录请求 Payload
+                        details = {'payload': filtered_payload}
 
                     # 保存日志
                     log_entry = AuditLog(