Update README docs and add feature screenshots

Renamed 'Excalidraw Complete' to 'Excalidraw Full' in both English and Chinese README files. Added new sections highlighting core differences from the official Excalidraw, and included four illustrative screenshots to showcase multi-canvas management, storage options, OAuth2 login, and AI features.

README.md

@@ -1,11 +1,25 @@
-# Excalidraw Complete: Your Self-Hosted, Cloud-Ready Collaboration Platform
+# Excalidraw Full: Your Self-Hosted, Cloud-Ready Collaboration Platform
 
-![README-zh](./README_zh.md)
+[中文说明](./README_zh.md)
 
-Excalidraw Complete has evolved. It's no longer just a simple wrapper for Excalidraw, but a powerful, self-hosted collaboration platform with a "Bring Your Own Cloud" (BYOC) philosophy. It provides user authentication, multi-canvas management, and the unique ability to connect directly to your own cloud storage from the frontend.
+Excalidraw Full has evolved. It's no longer just a simple wrapper for Excalidraw, but a powerful, self-hosted collaboration platform with a "Bring Your Own Cloud" (BYOC) philosophy. It provides user authentication, multi-canvas management, and the unique ability to connect directly to your own cloud storage from the frontend.
 
 The core idea is to let the backend handle user identity while giving you, the user, full control over where your data is stored.
 
+## Core Differences from Official Excalidraw
+
+- **Fully Self-Hosted Collaboration & Sharing**: Unlike the official version, all real-time collaboration and sharing features are handled by your own self-hosted backend, ensuring complete data privacy and control.
+- **Advanced Multi-Canvas Management**: Seamlessly create, save, and manage multiple canvases. Store your work on the server's backend (e.g., SQLite, S3) or connect the frontend directly to your personal cloud storage (e.g., Cloudflare KV) for true data sovereignty.
+- **Zero-Config AI Features**: Instantly access integrated OpenAI features like GPT-4 Vision after logging in—no complex client-side setup required. API keys are securely managed by the backend.
+
+![Multi-Canvas Management](./img/PixPin_2025-07-06_16-07-27.png)
+
+![Multi-Choice Storage](./img/PixPin_2025-07-06_16-08-29.png)
+
+![Oauth2 Login](./img/PixPin_2025-07-06_16-09-24.png)
+
+![AI Features](./img/PixPin_2025-07-06_16-09-55.png)
+
 ## Key Features
 
 - **GitHub Authentication**: Secure sign-in using GitHub OAuth.

README_zh.md

@@ -1,9 +1,25 @@
-# Excalidraw Complete: 您的自托管、云就绪协作平台
+# Excalidraw Full: 您的自托管、云就绪协作平台
 
-Excalidraw Complete 已经进化。它不再仅仅是 Excalidraw 的一个简单封装，而是一个强大的、自托管的协作平台，秉承"自带云"（BYOC - Bring Your Own Cloud）的理念。它提供用户认证、多画板管理，以及从前端直接连接到您自己的云存储的独特能力。
+Excalidraw Full 已经进化。它不再仅仅是 Excalidraw 的一个简单封装，而是一个强大的、自托管的协作平台，秉承"自带云"（BYOC - Bring Your Own Cloud）的理念。它提供用户认证、多画板管理，以及从前端直接连接到您自己的云存储的独特能力。
 
 其核心思想是让后端处理用户身份，同时让您（用户）完全控制数据的存储位置。
 
+## 与官方 Excalidraw 的核心区别
+
+- **完全自托管的协作与分享**: 与官方版 Excalidraw 不同，所有的实时协作和分享功能都由您自己部署的后端服务处理，确保了数据的私密性和可控性。
+- **强大的多画布管理**: 您可以轻松创建、保存和管理多个画布。数据可以存储在服务器后端（如 SQLite、S3），也可以由前端直接连接到您自己的云存储（如 Cloudflare KV），实现了真正的"数据主权"。
+- **开箱即用的 AI 功能**: 无需复杂的客户端配置，登录后即可直接使用集成的 OpenAI 功能（如 GPT-4 Vision），API 密钥由后端安全管理，前端只负责调用。
+
+
+![Multi-Canvas Management](./img/PixPin_2025-07-06_16-07-27.png)
+
+![Multi-Choice Storage](./img/PixPin_2025-07-06_16-08-29.png)
+
+![Oauth2 Login](./img/PixPin_2025-07-06_16-09-24.png)
+
+![AI Features](./img/PixPin_2025-07-06_16-09-55.png)
+
+
 ## 主要特性
 
 - **GitHub 认证**：使用 GitHub OAuth 安全登录。