i18n: Translate all Chinese to English across the codebase

Translate Chinese comments, log/error messages, validator labels and
Swagger annotations to English throughout the source code, generated
Swagger docs, config files and CI workflows.

Make the English README primary: README.md now holds the English docs
and README_EN.md holds the Chinese version, with cross-language links
updated accordingly.

Note: the generated docs/ swagger files were translated in place; run
`go generate ./...` (swag init) to regenerate them from the now-English
annotations when a Go toolchain is available.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.github/workflows/build.yml

@@ -29,7 +29,7 @@ on:
         default: 'https://github.com/lejianwen/rustdesk-api-web'
   push:
     tags:
-      - 'v*.*.*'  # 当推送带有版本号的 tag（例如 v1.0.0）时触发工作流
+      - 'v*.*.*'  # pushing a version-numbered tag (e.g. v1.0.0) triggers the workflow
       - 'test*'
 
 env:
@@ -66,7 +66,7 @@ jobs:
       - name: Set up Go environment
         uses: actions/setup-go@v4
         with:
-          go-version: '1.23'  # 选择 Go 版本
+          go-version: '1.23'  # select Go version
 
       - name: Set up npm
         uses: actions/setup-node@v2

.github/workflows/build_test.yml

@@ -61,7 +61,7 @@ jobs:
       - name: Set up Go environment
         uses: actions/setup-go@v4
         with:
-          go-version: '1.23'  # 选择 Go 版本
+          go-version: '1.23'  # select Go version
 
       - name: Set up npm
         uses: actions/setup-node@v2