Update documentation with Docker Hub container registry support

This commit updates all documentation to reflect the new Docker Hub support:

Documentation updates:
- Add Docker Hub to container registry tables in README.md and README.en.md
- Add Docker Hub examples showing both official and user images
- Update CLAUDE.md with Docker Hub platform category and special handling notes

Docker Hub usage examples:
- Official images: /cr/docker/v2/nginx/manifests/latest
- User images: /cr/docker/v2/nginxinc/nginx-unprivileged/manifests/latest

Docker Hub is now listed as the first container registry in documentation tables, reflecting its position as the most widely used container registry.

CLAUDE.md

@@ -76,7 +76,7 @@ Xget is a high-performance, secure acceleration engine for developer resources,
 
 1. **Code Repositories**: gh (GitHub), gl (GitLab), gitea, codeberg, sf (SourceForge), aosp
 2. **Package Managers**: npm, pypi, conda, maven, gradle, nuget, crates, etc.
-3. **Container Registries**: cr-ghcr, cr-gcr, cr-mcr, cr-quay, etc. (prefixed with `cr-`)
+3. **Container Registries**: cr-docker (Docker Hub), cr-ghcr, cr-gcr, cr-mcr, cr-quay, etc. (prefixed with `cr-`)
 4. **AI Inference Providers**: ip-openai, ip-anthropic, ip-gemini, etc. (prefixed with `ip-`)
 5. **Model/Dataset Platforms**: hf (Hugging Face), civitai
 6. **Linux Distributions**: debian, ubuntu, fedora, arch, etc.
@@ -95,6 +95,7 @@ Xget is a high-performance, secure acceleration engine for developer resources,
 - Handles Docker authentication flow with token fetching
 - Supports anonymous access to public repositories
 - All requests must use `/cr/` prefix (e.g., `/cr/ghcr/owner/repo`)
+- **Docker Hub Special Handling** ([src/index.js](src/index.js):600-604): Official images (single-name like `nginx`) are automatically prefixed with `library/` for authentication scope, while user images (namespace/image) are passed through unchanged
 
 **AI Inference APIs** ([src/index.js](src/index.js):110-146)
 

README.en.md

@@ -694,6 +694,7 @@ Xget supports multiple container registries, using the `cr/[Registry Prefix]` fo
 
 | Container Registry | Registry Prefix | Original URL Format | Accelerated URL Format |
 |-------------------|----------------|---------------------|------------------------|
+| Docker Hub | `docker` | `https://registry-1.docker.io/...` | `https://xget.xi-xu.me/cr/docker/...` |
 | Quay.io | `quay` | `https://quay.io/...` | `https://xget.xi-xu.me/cr/quay/...` |
 | Google Container Registry | `gcr` | `https://gcr.io/...` | `https://xget.xi-xu.me/cr/gcr/...` |
 | Microsoft Container Registry | `mcr` | `https://mcr.microsoft.com/...` | `https://xget.xi-xu.me/cr/mcr/...` |
@@ -712,6 +713,18 @@ Xget supports multiple container registries, using the `cr/[Registry Prefix]` fo
 | Gitpod Registry | `gitpod` | `https://registry.gitpod.io/...` | `https://xget.xi-xu.me/cr/gitpod/...` |
 
 ```url
+# Docker Hub original URL (official images)
+https://registry-1.docker.io/v2/library/nginx/manifests/latest
+
+# Converted (add cr/docker prefix)
+https://xget.xi-xu.me/cr/docker/v2/nginx/manifests/latest
+
+# Docker Hub original URL (user images)
+https://registry-1.docker.io/v2/nginxinc/nginx-unprivileged/manifests/latest
+
+# Converted (add cr/docker prefix)
+https://xget.xi-xu.me/cr/docker/v2/nginxinc/nginx-unprivileged/manifests/latest
+
 # GitHub Container Registry original URL
 https://ghcr.io/v2/nginxinc/nginx-unprivileged/manifests/latest
 

README.md

@@ -703,6 +703,7 @@ Xget 支持多个容器注册表，使用 `cr/[容器注册表前缀]` 格式：
 
 | 容器注册表 | 容器注册表前缀 | 原始 URL 格式 | 加速 URL 格式 |
 |----------|------|--------------|--------------|
+| Docker Hub | `docker` | `https://registry-1.docker.io/...` | `https://xget.xi-xu.me/cr/docker/...` |
 | Quay.io | `quay` | `https://quay.io/...` | `https://xget.xi-xu.me/cr/quay/...` |
 | 谷歌容器注册表 | `gcr` | `https://gcr.io/...` | `https://xget.xi-xu.me/cr/gcr/...` |
 | 微软容器注册表 | `mcr` | `https://mcr.microsoft.com/...` | `https://xget.xi-xu.me/cr/mcr/...` |
@@ -721,6 +722,18 @@ Xget 支持多个容器注册表，使用 `cr/[容器注册表前缀]` 格式：
 | Gitpod 注册表 | `gitpod` | `https://registry.gitpod.io/...` | `https://xget.xi-xu.me/cr/gitpod/...` |
 
 ```url
+# Docker Hub 原始 URL（官方镜像）
+https://registry-1.docker.io/v2/library/nginx/manifests/latest
+
+# 转换后（添加 cr/docker 前缀）
+https://xget.xi-xu.me/cr/docker/v2/nginx/manifests/latest
+
+# Docker Hub 原始 URL（用户镜像）
+https://registry-1.docker.io/v2/nginxinc/nginx-unprivileged/manifests/latest
+
+# 转换后（添加 cr/docker 前缀）
+https://xget.xi-xu.me/cr/docker/v2/nginxinc/nginx-unprivileged/manifests/latest
+
 # GitHub 容器注册表原始 URL
 https://ghcr.io/v2/nginxinc/nginx-unprivileged/manifests/latest