fix(seo): load site URL from Vite environment

vite.config.ts

@@ -1,4 +1,4 @@
-import { defineConfig } from 'vite'
+import { defineConfig, loadEnv } from 'vite'
 import { mkdirSync, writeFileSync } from 'node:fs'
 import { fileURLToPath, URL } from 'node:url'
 import vue from '@vitejs/plugin-vue'
@@ -10,17 +10,20 @@ const publicRoutes = [
   '/community',
 ]
 
-function getSiteUrl() {
-  const explicitUrl = process.env.VITE_SITE_URL
-  const siteUrl = explicitUrl
-  return siteUrl
+const DEFAULT_SITE_URL = 'http://localhost:5173'
+
+function getSiteUrl(value?: string) {
+  const siteUrl = new URL(value?.trim() || DEFAULT_SITE_URL)
+  if (!['http:', 'https:'].includes(siteUrl.protocol)) {
+    throw new Error('VITE_SITE_URL 必须使用 http 或 https 协议')
+  }
+  return siteUrl.href.replace(/\/$/, '')
 }
 
-function seoFilesPlugin() {
+function seoFilesPlugin(siteUrl: string) {
   return {
     name: 'opencloud-seo-files',
     closeBundle() {
-      const siteUrl = getSiteUrl()
       mkdirSync('dist/.well-known', { recursive: true })
 
       const robots = [
@@ -55,19 +58,24 @@ function seoFilesPlugin() {
   }
 }
 
-export default defineConfig({
-  plugins: [vue(), tailwindcss(), seoFilesPlugin()],
-  server: {
-    port: 5173,
-    strictPort: true,
-  },
-  preview: {
-    port: 5173,
-    strictPort: true,
-  },
-  resolve: {
-    alias: {
-      '@': fileURLToPath(new URL('./src', import.meta.url)),
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), 'VITE_')
+  const siteUrl = getSiteUrl(env.VITE_SITE_URL)
+
+  return {
+    plugins: [vue(), tailwindcss(), seoFilesPlugin(siteUrl)],
+    server: {
+      port: 5173,
+      strictPort: true,
     },
-  },
+    preview: {
+      port: 5173,
+      strictPort: true,
+    },
+    resolve: {
+      alias: {
+        '@': fileURLToPath(new URL('./src', import.meta.url)),
+      },
+    },
+  }
 })