feat(auth): 添加token前缀配置支持

- 在sa-token配置中增加token-prefix字段
- 默认设置为Bearer前缀以符合标准认证协议
- 支持前端Authorization头的标准格式配置

src/main/resources/sa-token-config.yml

@@ -2,6 +2,8 @@
 sa-token:
   # token name (frontend needs to use this name, e.g., Authorization: Bearer xxxx, or just satoken: xxxx)
   token-name: Authorization
+  # token prefix (standard for Bearer tokens)
+  token-prefix: Bearer
   # token validity period (seconds), -1 means never expire
   timeout: 2592000
   # token temporary validity (seconds), -1 means never expire