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-springboot2-client/src/main/java/cn/odboy/confcenter/ConfigcenterContext.java

@@ -487,6 +487,10 @@ public class ConfigcenterContext {
         }
     }
 
+    public String getToken() {
+        return token;
+    }
+
     public String buildTokenParameter(String url) {
         if (token == null || token.isEmpty()) {
             return url;

kenaito-conf-springboot2-client/src/main/java/cn/odboy/confcenter/InternalConfigChangeListener.java

@@ -48,12 +48,15 @@ public class InternalConfigChangeListener {
 			params.put("ignoreGlobal", String.valueOf(context.isIgnoreGlobal()));
 		}
 		params.put("lastTime", Long.parseLong(ConfigcenterContext.getProperty(LATEST_FETCH_TIMESTAMP, String.valueOf(System.currentTimeMillis()))));
+		if (context.getToken() != null && !context.getToken().isEmpty()) {
+			params.put("token", context.getToken());
+		}
 
 		hbScheduledExecutor.scheduleAtFixedRate(new Runnable() {
 			@Override
 			public void run() {
 				try {
-					String safeUrl = ConfigcenterContext.getInstance().buildTokenParameter(url);
+					String safeUrl = url;
 					String response = ConfigcenterContext.httpPostJson(safeUrl, JSON.toJSONString(params));
 					if (response != null) {
 						Map<String, Object> map = JSON.parseObject(response, Map.class);