feat(docs): 更新PowerShell文档语法高亮配置

修复PowerShell文档中的代码块语法标识，将Plain类型改为txt类型，
并修正powershell拼写错误为powershell。同时更新Svelte页面组件中
的语法高亮插件配置，添加eslint禁用注释，优化语言检测逻辑并
支持fallthrough语法。

Author: vhtmui

docs/PowerShell.md

@@ -28,7 +28,7 @@ Import-Module PSFTP
 
 抛出错误默认显示powershell自动构建的位置和信息，如
 
-```Plain
+```txt
 CheckMaterial: 
 Line |
    3 |  CheckMaterial 'hhhh'
@@ -38,13 +38,13 @@ Line |
 
 通过传参可以显示其他消息，但前面的位置信息不会改变，如如下代码：
 
-```Plain
+```txt
 Write-Error -Message "`n{InvocationPosition}:`n$($_.InvocationInfo.PositionMessage)`n{Message}:`n$($_.Exception.Message)`n{ErrorId}:`n$($_.FullyQualifiedErrorId)" -ErrorAction Stop
 ```
 
 显示的错误如下：
 
-```Plain
+```txt
 CheckMaterial: 
 Line |
    3 |  CheckMaterial 'hhhh'
@@ -164,7 +164,7 @@ $thread.Start()
 
 1. 创建FTP请求
 
-   ```powerhsell
+   ```powershell
    [System.Net.FtpWebRequest]$Request = [System.Net.WebRequest]::Create($FTP_Uri)
    ```
 

src/routes/docs/[...docs]/+page.svelte

@@ -1,4 +1,5 @@
 <script>
+	/* eslint-disable no-fallthrough */
 	import Markdown from 'svelte-exmarkdown';
 	import { gfmPlugin } from 'svelte-exmarkdown/gfm';
 
@@ -16,36 +17,40 @@
 	const docName = $derived(data.docName);
 
 	function getLangs() {
+		let langs = [];
 		switch (true) {
 			case docName.match(/powershell/i) && true:
-				return [import('shiki/langs/powershell.mjs')];
+				console.log('powershell');
+				langs.push(import('shiki/langs/powershell.mjs'));
 			case docName.match(/rust/i) && true:
-				return [import('shiki/langs/rust.mjs')];
+				langs.push(import('shiki/langs/rust.mjs'));
 			case docName.match(/web/i) && true:
-				return [
+				langs.push(
 					import('shiki/langs/javascript.mjs'),
 					import('shiki/langs/html.mjs'),
 					import('shiki/langs/css.mjs')
-				];
+				);
 			default:
-				return [];
+				// langs.push('text');
 		}
+		return langs;
 	}
-	
-
-	const shikiPluginPromise = $derived(createHighlighterCore({
-		themes: [import('shiki/themes/slack-dark.mjs'), import('shiki/themes/slack-ochin.mjs')],
-		langs: [...getLangs()],
-		engine: createOnigurumaEngine(import('shiki/wasm'))
-	}).then((highlighter) => {
-		return {
-			rehypePlugin: [
-				rehypeShikiFromHighlighter,
-				highlighter,
-				{ themes: { light: 'slack-ochin', dark: 'slack-dark' } }
-			]
-		};
-	}));
+
+	const shikiPluginPromise = $derived(
+		createHighlighterCore({
+			themes: [import('shiki/themes/slack-dark.mjs'), import('shiki/themes/slack-ochin.mjs')],
+			langs: [...getLangs()],
+			engine: createOnigurumaEngine(import('shiki/wasm'))
+		}).then((highlighter) => {
+			return {
+				rehypePlugin: [
+					rehypeShikiFromHighlighter,
+					highlighter,
+					{ themes: { light: 'slack-ochin', dark: 'slack-dark' } }
+				]
+			};
+		})
+	);
 
 	/** @type {import('svelte-exmarkdown').Plugin} */
 	const csPlugin = {