feat: wire up mic/speaker and Google Translate backend for live translation

Frontend uses the Web Speech API for speech-to-text and text-to-speech
(no key needed). Adds POST /api/translate backed by Google Cloud
Translation API v2, gated on GOOGLE_TRANSLATE_API_KEY (placeholder
added to .env/.env.example, unset by default).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/Backend/src/routes/index.ts

@@ -47,6 +47,7 @@ import insuranceStatusBcbsMaRoutes from "./insuranceStatusBcbsMa";
 import labRxRoutes from "./lab-rx";
 import seleniumSettingsRoutes from "./selenium-settings";
 import typeAgentRoutes from "./type-agent";
+import translateRoutes from "./translate";
 
 const router = Router();
 
@@ -98,5 +99,6 @@ router.use("/fee-schedule", feeScheduleRoutes);
 router.use("/license", licenseRoutes);
 router.use("/lab-rx", labRxRoutes);
 router.use("/selenium-settings", seleniumSettingsRoutes);
+router.use("/translate", translateRoutes);
 
 export default router;

apps/Backend/src/routes/translate.ts

@@ -0,0 +1,50 @@
+import express, { Request, Response } from "express";
+
+const router = express.Router();
+
+// POST /api/translate
+router.post("/", async (req: Request, res: Response): Promise<any> => {
+  try {
+    const userId = req.user?.id;
+    if (!userId) return res.status(401).json({ message: "Unauthorized" });
+
+    const apiKey = process.env.GOOGLE_TRANSLATE_API_KEY;
+    if (!apiKey) {
+      return res.status(503).json({ message: "Translation is not configured yet. Set GOOGLE_TRANSLATE_API_KEY." });
+    }
+
+    const { text, targetLang, sourceLang } = req.body as { text?: string; targetLang?: string; sourceLang?: string };
+    if (!text?.trim() || !targetLang) {
+      return res.status(400).json({ message: "text and targetLang are required" });
+    }
+
+    const params = new URLSearchParams({
+      key: apiKey,
+      q: text,
+      target: targetLang,
+      format: "text",
+    });
+    if (sourceLang) params.set("source", sourceLang);
+
+    const googleRes = await fetch(`https://translation.googleapis.com/language/translate/v2?${params.toString()}`, {
+      method: "POST",
+    });
+
+    if (!googleRes.ok) {
+      const errBody = await googleRes.json().catch(() => null);
+      const message = errBody?.error?.message || "Translation request failed";
+      return res.status(googleRes.status).json({ message });
+    }
+
+    const data = await googleRes.json();
+    const translation = data?.data?.translations?.[0];
+    return res.status(200).json({
+      translatedText: translation?.translatedText ?? "",
+      detectedSourceLanguage: translation?.detectedSourceLanguage,
+    });
+  } catch (err) {
+    return res.status(500).json({ message: "Failed to translate text", details: String(err) });
+  }
+});
+
+export default router;