代码审查修复：改进参数验证和代码质量

Co-authored-by: binarywang <1343140+binarywang@users.noreply.github.com>

Author: Copilot

spring-boot-starters/wx-java-open-multi-spring-boot-starter/src/main/java/com/binarywang/spring/starter/wxjava/open/configuration/services/AbstractWxOpenConfiguration.java

@@ -40,9 +40,10 @@ protected WxOpenMultiServices wxOpenMultiServices(WxOpenMultiProperties wxOpenMu
     Collection<WxOpenSingleProperties> apps = appsMap.values();
     if (apps.size() > 1) {
       // 校验 appId 是否唯一
+      String nullAppIdPlaceholder = "__NULL_APP_ID__";
       boolean multi = apps.stream()
         // 没有 appId，如果不判断是否为空，这里会报 NPE 异常
-        .collect(Collectors.groupingBy(c -> c.getAppId() == null ? 0 : c.getAppId(), Collectors.counting()))
+        .collect(Collectors.groupingBy(c -> c.getAppId() == null ? nullAppIdPlaceholder : c.getAppId(), Collectors.counting()))
         .entrySet().stream().anyMatch(e -> e.getValue() > 1);
       if (multi) {
         throw new RuntimeException("请确保微信开放平台配置 appId 的唯一性");
@@ -85,6 +86,14 @@ private void configApp(WxOpenInMemoryConfigStorage config, WxOpenSinglePropertie
     String apiHostUrl = appProperties.getApiHostUrl();
     String accessTokenUrl = appProperties.getAccessTokenUrl();
 
+    // appId 和 secret 是必需的
+    if (StringUtils.isBlank(appId)) {
+      throw new IllegalArgumentException("微信开放平台 appId 不能为空");
+    }
+    if (StringUtils.isBlank(secret)) {
+      throw new IllegalArgumentException("微信开放平台 secret 不能为空");
+    }
+
     config.setComponentAppId(appId);
     config.setComponentAppSecret(secret);
     if (StringUtils.isNotBlank(token)) {

spring-boot-starters/wx-java-open-multi-spring-boot-starter/src/main/resources/META-INF/spring.factories

@@ -1,2 +1,2 @@
 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
-com.binarywang.spring.starter.wxjava.open.autoconfigure.WxOpenMultiAutoConfiguration
+com.binarywang.spring.starter.wxjava.open.autoconfigure.WxOpenMultiAutoConfiguration

spring-boot-starters/wx-java-open-multi-spring-boot-starter/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

@@ -1 +1 @@
-com.binarywang.spring.starter.wxjava.open.autoconfigure.WxOpenMultiAutoConfiguration
+com.binarywang.spring.starter.wxjava.open.autoconfigure.WxOpenMultiAutoConfiguration