docs: add instructions for bun package manager (#12182)

packages/vant/docs/markdown/migrate-from-v3.en-US.md

@@ -19,6 +19,9 @@ yarn add vant@^4 @vant/compat@^1
 
 # Install via pnpm
 pnpm add vant@^4 @vant/compat@^1
+
+# Install via Bun
+bun add vant@^4 @vant/compat@^1
 ```
 
 You can also change the version directly in the `dependencies` field of `package.json`, and you will need to reinstall the dependencies after the change.

packages/vant/docs/markdown/migrate-from-v3.zh-CN.md

@@ -19,6 +19,9 @@ yarn add vant@^4 @vant/compat@^1
 
 # 通过 pnpm 安装
 pnpm add vant@^4 @vant/compat@^1
+
+# 通过 Bun 安装
+bun add vant@^4 @vant/compat@^1
 ```
 
 你也可以直接修改 `package.json` 的 `dependencies` 字段中的版本号，修改完成后需要重新安装依赖。

packages/vant/docs/markdown/quickstart.en-US.md

@@ -14,7 +14,7 @@ npm i vant
 npm i vant@latest-v2
 ```
 
-Using `yarn` or `pnpm`:
+Using `yarn`, `pnpm`, or `bun`:
 
 ```bash
 # with yarn
@@ -22,6 +22,9 @@ yarn add vant
 
 # with pnpm
 pnpm add vant
+
+# with Bun
+bun add vant
 ```
 
 ### CDN
@@ -126,6 +129,9 @@ yarn add unplugin-vue-components -D
 
 # with pnpm
 pnpm add unplugin-vue-components -D
+
+# with Bun
+bun add unplugin-vue-components -D
 ```
 
 #### 2. Configure Plugin
@@ -235,6 +241,9 @@ yarn add @vant/nuxt -D
 
 # with pnpm
 pnpm add @vant/nuxt -D
+
+# with Bun
+bun add @vant/nuxt -D
 ```
 
 #### 2. Add Module

packages/vant/docs/markdown/quickstart.zh-CN.md

@@ -26,6 +26,9 @@ yarn add vant
 
 # 通过 pnpm 安装
 pnpm add vant
+
+# 通过 Bun 安装
+bun add vant
 ```
 
 ### 通过 CDN 安装
@@ -130,6 +133,9 @@ yarn add unplugin-vue-components -D
 
 # 通过 pnpm 安装
 pnpm add unplugin-vue-components -D
+
+# 通过 bun 安装
+bun add unplugin-vue-components -D
 ```
 
 #### 2. 配置插件
@@ -239,6 +245,9 @@ yarn add @vant/nuxt -D
 
 # 通过 pnpm 安装
 pnpm add @vant/nuxt -D
+
+# 通过 Bun 安装
+bun add @vant/nuxt -D
 ```
 
 #### 2. 增加模块

packages/vant/docs/markdown/vant-use-intro.en-US.md

@@ -17,6 +17,9 @@ yarn add @vant/use
 
 # with pnpm
 pnpm add @vant/use
+
+# with Bun
+bun add @vant/use
 ```
 
 ### Demo

packages/vant/docs/markdown/vant-use-intro.zh-CN.md

@@ -17,6 +17,9 @@ yarn add @vant/use
 
 # with pnpm
 pnpm add @vant/use
+
+# with Bun
+bun add @vant/use
 ```
 
 ### 示例