feat: CDN integration with OSS and API Gateway CDN support (#195)

This pull request introduces support for Alibaba Cloud CDN and OSS
Transfer Acceleration, expands the SDK client layer, and includes
dependency upgrade fixes and code review corrections.

## Major Features

### CDN and Transfer Acceleration Support
- CDN acceleration and OSS Transfer Acceleration for static website
hosting
- Simple (`cdn: true`) and advanced configuration options
- Dual-layer acceleration (CDN + Transfer Acceleration)
- Full CDN lifecycle: domain creation, certificate binding,
cache/compression/protocol/HTTPS redirect configuration

### SDK Client Expansion
- New `cdnOperations` module with domain, certificate, cache, protocol,
compression, and HTTPS redirect management
- CDN SDK client integrated into Aliyun client factory
- DNS operations for CNAME record management

## Bug Fixes & Corrections

### CDN API Fix (Critical)
- `applyProtocolConfig` now uses correct `forward_scheme` feature (not
`range`) for origin protocol configuration
- The `range` feature controls back-to-origin range slicing, not
protocol. Origin protocol requires `forward_scheme` with `enable`
parameter.

### Dependency Upgrade Compatibility
- CDN SDK v9.2.0: `SetDomainServerCertificate` →
`SetCdnDomainSSLCertificate` API migration
- @types/jest v30: tsconfig `types` field for Jest globals
- Flaky test retry logic for ECONNRESET race condition

### Code Quality
- Added `dns` property to `MockAliyunClient` type (was missing from
mock)
- Removed redundant `isCdnEnabled` double-check in OSS www CDN block
- Added 12 tests for `BatchSetCdnDomainConfig` functions
(`applyCacheConfig`, `applyProtocolConfig`, `applyCompression`,
`applyHttpsRedirect`)

## Documentation
- Updated README with CDN/acceleration configuration examples
- Clarified project value proposition in English and Chinese docs

## Test Coverage
- 128 test suites, 2219 tests passed
- 94.31% coverage (above 85% threshold)

## Commits
1. `feat: CDN integration with OSS and API Gateway CDN support` -
Original feature
2. `fix: resolve dependency upgrade compatibility issues` - SDK/API
migration
3. `fix: correct CDN origin protocol API and code review issues` - Bug
fixes and tests

Author: Blankll

.gitignore

@@ -6,3 +6,4 @@ coverage/
 .DS_Store
 artifacts/
 .serverlessinsight/
+.omo/

README.md

@@ -9,7 +9,9 @@
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![codecov](https://codecov.io/gh/geek-fun/serverlessinsight/graph/badge.svg?token=ISW7MFuSlf)](https://codecov.io/gh/geek-fun/serverlessinsight)
 
-**Full life cycle cross-provider serverless application management for your fast-growing business**
+**Describe your app. We handle the rest.**
+
+*Full life cycle cross-provider serverless application management for your fast-growing business*
 
 [Website](https://serverlessinsight.geekfun.club) • [Documentation](https://serverlessinsight.geekfun.club) • [Examples](./samples) • [中文文档](./README.zh-CN.md)
 
@@ -344,6 +346,61 @@ For OSS static website hosting, ServerlessInsight supports:
 
 For detailed configuration, see [OSS Custom Domain Binding Guide](./docs/oss-custom-domain-binding.md).
 
+### CDN Acceleration & OSS Transfer Acceleration
+
+ServerlessInsight supports CDN acceleration and OSS Transfer Acceleration for buckets, enabling global content delivery and optimized origin fetch.
+
+**CDN** (`cdn`): Create a CDN distribution in front of your bucket for edge caching and global acceleration. Accepts `boolean` (simple on/off) or `object` for advanced configuration:
+
+```yaml
+buckets:
+  # Simple: CDN with sensible defaults
+  my_site:
+    name: my-static-site
+    website:
+      code: ./dist
+      index: index.html
+    domain:
+      domain_name: www.example.com
+      certificate_id: cas-abc123
+      cdn: true
+
+  # Advanced: CDN with custom config
+  releases:
+    name: app-releases
+    security:
+      acl: PRIVATE
+    domain:
+      domain_name: releases.example.com
+      cdn:
+        enabled: true
+        cdn_type: download       # web | download | video
+        scope: global            # domestic | overseas | global
+```
+
+**Transfer Acceleration** (`accelerate`): Enables OSS Transfer Acceleration for cross-region/global data transfers. Routes traffic through Alibaba backbone network:
+
+```yaml
+buckets:
+  cross_region_backups:
+    name: backup-bucket
+    domain:
+      domain_name: backups.internal.example.com
+      accelerate: true                    # No CDN, just accelerate
+
+  # CDN + Accelerate (dual-layer)
+  global_assets:
+    name: global-assets
+    domain:
+      domain_name: assets.example.com
+      cdn:
+        enabled: true
+        cdn_type: web
+      accelerate: true                    # CDN origin uses accelerated endpoint
+```
+
+**Backward Compatibility**: Existing `website.domain` config continues to work. When a bucket uses `website.domain` without the top-level `domain` block, a deprecation notice is logged suggesting migration to the canonical form.
+
 ---
 
 ## 🗄️ State Management

README.zh-CN.md

@@ -9,7 +9,9 @@
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![codecov](https://codecov.io/gh/geek-fun/serverlessinsight/graph/badge.svg?token=ISW7MFuSlf)](https://codecov.io/gh/geek-fun/serverlessinsight)
 
-**为快速增长的业务提供全生命周期跨云服务商的 Serverless 应用管理**
+**描述你的应用，剩下的交给我们。**
+
+*为快速增长的业务提供全生命周期跨云服务商的 Serverless 应用管理*
 
 [官方网站](https://serverlessinsight.geekfun.club) • [文档](https://serverlessinsight.geekfun.club) • [示例](./samples) • [English](./README.md)