docs: 赞助商图片改用本地路径并新增火山引擎 CodingPlan

- Atlas Cloud 图片从远程链接改为 docs/image/sponsor/ 本地路径
- 新增火山引擎 CodingPlan 开发者计划赞助商（中英文 README 同步）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

README_EN.md

@@ -211,12 +211,19 @@ Thanks to the following excellent open-source projects for their support:
 **Thanks to the following sponsors for supporting this project:**
 
 > <a href="https://www.atlascloud.ai?ref=89F97E">
->   <img src="https://ruoyiai-1254149996.cos.ap-guangzhou.myqcloud.com/2026/04/19/atlascloud.png" alt="Atlas Cloud" width="120" height="100">
+>   <img src="docs/image/sponsor/atlascloud_banner.png" alt="Atlas Cloud" width="160" height="80">
 > </a>
 >
 > [Visit Atlas Cloud](https://www.atlascloud.ai?ref=89F97E) · [Coding Plan Promotion](https://www.atlascloud.ai/console/coding-plan) <br>
 > A full-modal AI inference platform that gives developers a unified AI API, supporting video generation, image generation, and LLMs. Connect once to access **300+ curated models**.<br>
 
+> <a href="https://www.volcengine.com/activity/codingplan?utm_campaign=hw&utm_content=hw&utm_medium=devrel_tool_web&utm_source=OWO&utm_term=ageerle-ruoyi-ai">
+>   <img src="docs/image/sponsor/huoshan.png" alt="Volcengine CodingPlan" width="160" height="80">
+> </a>
+>
+> [Volcengine CodingPlan Developer Program](https://www.volcengine.com/activity/codingplan?utm_campaign=hw&utm_content=hw&utm_medium=devrel_tool_web&utm_source=OWO&utm_term=ageerle-ruoyi-ai) <br>
+> Volcengine is ByteDance's cloud and AI service platform. Volcengine Ark provides API access to Doubao LLM, DeepSeek, and more — a one-stop AI development and inference platform for developers.<br>
+
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