feat: integrate FIR library and AI FIR controls

vite.legacy.config.ts

@@ -1,3 +1,4 @@
+import { firDevProxy } from "./firDevProxy";
 import { jsxLocPlugin } from "@builder.io/vite-plugin-jsx-loc";
 import react from "@vitejs/plugin-react";
 import path from "node:path";
@@ -51,7 +52,7 @@ const deployBase = isProd
   : "/";
 
 export default defineConfig({
-  plugins: [legacySkipModernCssPlugin(), legacyIndexRewritePlugin(), react(), jsxLocPlugin()],
+  plugins: [firDevProxy(),legacySkipModernCssPlugin(), legacyIndexRewritePlugin(), react(), jsxLocPlugin()],
   define: {
     "import.meta.env.VITE_X9_LEGACY": JSON.stringify("1"),
   },
@@ -108,6 +109,15 @@ export default defineConfig({
     strictPort: false,
     host: true,
     proxy: {
+      // Same-origin AI endpoint works for localhost and LAN visitors, including SSE.
+      "/ai-api": {
+        target: "http://127.0.0.1:8001",
+        changeOrigin: true,
+        rewrite: p => p.replace(/^\/ai-api/, ""),
+        timeout: 0,
+        proxyTimeout: 0,
+      },
+      "/fir-library": { target: "http://127.0.0.1:8000", changeOrigin: true, rewrite: p => p.replace(/^\/fir-library/, "/api") },
       "/luxsin-audio-api": {
         target: "https://api.luxsin.com.cn",
         changeOrigin: true,