refactor: define IMiniAuthService interface

Phase 1, Step 1.2.1: Extract authentication logic interface
- Define login() method signature
- Define logout() method signature
- Define verifyToken() method signature

Related to Phase 1 refactoring plan

src/main/java/org/springblade/modules/martial/service/IMiniAuthService.java

@@ -0,0 +1,33 @@
+package org.springblade.modules.martial.service;
+
+import org.springblade.core.tool.api.R;
+import org.springblade.modules.martial.pojo.dto.MiniLoginDTO;
+import org.springblade.modules.martial.pojo.vo.MiniLoginVO;
+
+/**
+ * Mini App Authentication Service
+ * Phase 1, Step 1.2.1: Extract authentication logic from controller
+ */
+public interface IMiniAuthService {
+    
+    /**
+     * Login with invite code
+     * @param dto login request
+     * @return login response with token and user info
+     */
+    R<MiniLoginVO> login(MiniLoginDTO dto);
+    
+    /**
+     * Logout
+     * @param token access token
+     * @return logout result
+     */
+    R<String> logout(String token);
+    
+    /**
+     * Verify token
+     * @param token access token
+     * @return verification result
+     */
+    R<Boolean> verifyToken(String token);
+}