feat(stealth): 优化隐身对抗并引入双版本发布体系

- 将 CreepJS like headless 指标优化到 0%（headless/stealth 维持 0%）

- 新增 ActiveText 与 prefers-color-scheme 探针修复

- 版本号采用 <upstream>-fork.<fork> 格式并在 --version 输出 upstream/fork

- 更新 README、SKILL 与 docs 中的版本体系说明

docs/src/app/commands/page.mdx

@@ -32,9 +32,16 @@ agent-browser pdf <path>              # Save page as PDF
 agent-browser snapshot                # Accessibility tree with refs
 agent-browser eval <js>               # Run JavaScript
 agent-browser connect <port|url>      # Connect to browser via CDP
+agent-browser --version               # Show CLI version
 agent-browser close                   # Close browser (aliases: quit, exit)
 ```
 
+Fork builds print dual-version metadata with `--version`:
+
+```bash
+agent-browser 0.14.0-fork.1 (upstream 0.14.0, fork 1)
+```
+
 ## Get info
 
 ```bash

docs/src/app/installation/page.mdx

@@ -60,6 +60,15 @@ pnpm build:native
 pnpm link --global
 ```
 
+## Fork versioning
+
+Fork releases use a dual-version format:
+
+- `<upstream>-fork.<fork>`
+- Example: `0.14.0-fork.1`
+
+`agent-browser --version` prints the full version and also shows upstream and fork parts for fork builds.
+
 ## Linux dependencies
 
 On Linux, install system dependencies: