feat(token): 将token迁移至请求体并兼容旧版客户端

- C++客户端在请求payload中添加token字段
- .NET客户端在请求payload中添加token字段
- Rust客户端在请求payload中添加token字段
- SpringBoot2客户端移除buildTokenParameter调用，改为将token放入请求体
- SpringBoot3客户端移除buildTokenParameter调用，改为将token放入请求体
- SpringBoot2/3客户端新增getToken方法供内部调用
- 服务端增加兼容逻辑，优先从请求体获取token，为空时回退至URL query参数

kenaito-conf-springboot3-client/src/main/java/cn/odboy/confcenter/ConfigcenterContext.java

@@ -645,6 +645,10 @@ public class ConfigcenterContext {
 		}
 	}
 
+	public String getToken() {
+		return token;
+	}
+
 	public String buildTokenParameter(String url) {
 		if (StringUtils.isBlank(token)) {
 			return url;

kenaito-conf-springboot3-client/src/main/java/cn/odboy/confcenter/InternalConfigChangeListener.java

@@ -82,13 +82,16 @@ public class InternalConfigChangeListener {
 	@SuppressWarnings("unchecked")
 	private void poll(ConfigcenterContext context, String[] baseUrls) {
 		for (String baseUrl : baseUrls) {
-			String url = context.buildTokenParameter(baseUrl + "/api/fetchChangedConfigs");
+			String url = baseUrl + "/api/fetchChangedConfigs";
 			Map<String, Object> params = new HashMap<>();
 			params.put("version", context.getVersion());
 			params.put("appName", context.getApp());
 			params.put("env", context.getEnv());
 			params.put("ignoreGlobal", context.isIgnoreGlobal());
 			params.put("lastTime", lastTime);
+			if (context.getToken() != null && !context.getToken().isEmpty()) {
+				params.put("token", context.getToken());
+			}
 
 			String response;
 			try {