revert(web): restore vite.config.ts to use port 3000

Revert the vite.config.ts changes from e93adaa that changed the dev
server port from 3000 to 8181 and added local dev features (env loading,
serve-skill-md plugin, proxy headers). These were local development
configs that broke CI by changing the port away from 3000 which the
Makefile health check expects.

web/vite.config.ts

@@ -1,87 +1,32 @@
-import fs from 'fs'
-import { defineConfig, loadEnv, type ProxyOptions } from 'vite'
+import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import path from 'path'
 
-function forwardOriginalHostToBackend(): NonNullable<ProxyOptions['configure']> {
-  return (proxy) => {
-    proxy.on('proxyReq', (proxyReq, req) => {
-      const host = req.headers.host
-      if (host) {
-        proxyReq.setHeader('X-Forwarded-Host', host)
-        const proto = req.headers['x-forwarded-proto']
-        proxyReq.setHeader(
-          'X-Forwarded-Proto',
-          typeof proto === 'string' ? proto : 'http',
-        )
-      }
-    })
-  }
-}
-
-export default defineConfig(({ mode }) => {
-  const env = loadEnv(mode, process.cwd(), '')
-  // Override with VITE_BACKEND_URL in .env.local
-  const backend = env.VITE_BACKEND_URL || 'http://localhost:8080'
-
-  return {
-    plugins: [
-      react(),
-      {
-        name: 'serve-skill-md',
-        configureServer(server) {
-          server.middlewares.use('/registry/skill.md', (_req, res) => {
-            const template = fs.readFileSync(
-              path.resolve(__dirname, 'src/docs/skill.md.template'),
-              'utf-8',
-            )
-            const origin = `http://localhost:${server.config.server.port || 8181}`
-            res.setHeader('Content-Type', 'text/plain; charset=utf-8')
-            res.end(
-              template.replace(/\$\{SKILLHUB_PUBLIC_BASE_URL\}/g, origin),
-            )
-          })
-        },
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+  test: {
+    exclude: ['**/node_modules/**', '**/e2e/**'],
+  },
+  server: {
+    port: 3000,
+    watch: {
+      usePolling: true,
+      interval: 150,
+    },
+    proxy: {
+      '/api': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
       },
-    ],
-    resolve: {
-      alias: {
-        '@': path.resolve(__dirname, './src'),
+      '/oauth2': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
       },
     },
-    test: {
-      exclude: ['**/node_modules/**', '**/e2e/**'],
-    },
-    server: {
-      // Listen on 0.0.0.0 so LAN / other machines can reach dev (still need firewall rules for true public IP).
-      host: true,
-      port: 8181,
-      watch: {
-        usePolling: true,
-        interval: 150,
-      },
-      proxy: {
-        '/api': {
-          target: backend,
-          changeOrigin: true,
-          configure: forwardOriginalHostToBackend(),
-        },
-        '/oauth2': {
-          target: backend,
-          changeOrigin: true,
-          configure: forwardOriginalHostToBackend(),
-        },
-        '/login/oauth2': {
-          target: backend,
-          changeOrigin: true,
-          configure: forwardOriginalHostToBackend(),
-        },
-        '/actuator': {
-          target: backend,
-          changeOrigin: true,
-          configure: forwardOriginalHostToBackend(),
-        },
-      },
-    },
-  }
+  },
 })