feat(api): add no-reply OpenAI-compatible API service

no-reply-api/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "whispergate-no-reply-api",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "start": "node server.mjs"
+  }
+}

no-reply-api/server.mjs

@@ -0,0 +1,82 @@
+import http from "node:http";
+
+const port = Number(process.env.PORT || 8787);
+const modelName = process.env.NO_REPLY_MODEL || "whispergate-no-reply-v1";
+
+function sendJson(res, status, payload) {
+  res.writeHead(status, { "Content-Type": "application/json; charset=utf-8" });
+  res.end(JSON.stringify(payload));
+}
+
+function noReplyChatCompletion(reqBody) {
+  return {
+    id: `chatcmpl_whispergate_${Date.now()}`,
+    object: "chat.completion",
+    created: Math.floor(Date.now() / 1000),
+    model: reqBody?.model || modelName,
+    choices: [
+      {
+        index: 0,
+        message: { role: "assistant", content: "NO_REPLY" },
+        finish_reason: "stop"
+      }
+    ],
+    usage: { prompt_tokens: 0, completion_tokens: 1, total_tokens: 1 }
+  };
+}
+
+function noReplyResponses(reqBody) {
+  return {
+    id: `resp_whispergate_${Date.now()}`,
+    object: "response",
+    created_at: Math.floor(Date.now() / 1000),
+    model: reqBody?.model || modelName,
+    output: [
+      {
+        type: "message",
+        role: "assistant",
+        content: [{ type: "output_text", text: "NO_REPLY" }]
+      }
+    ],
+    usage: { input_tokens: 0, output_tokens: 1, total_tokens: 1 }
+  };
+}
+
+const server = http.createServer((req, res) => {
+  if (req.method === "GET" && req.url === "/health") {
+    return sendJson(res, 200, { ok: true, service: "whispergate-no-reply-api" });
+  }
+
+  if (req.method !== "POST") {
+    return sendJson(res, 404, { error: "not_found" });
+  }
+
+  let body = "";
+  req.on("data", (chunk) => {
+    body += chunk;
+    if (body.length > 1_000_000) req.destroy();
+  });
+
+  req.on("end", () => {
+    let parsed = {};
+    try {
+      parsed = body ? JSON.parse(body) : {};
+    } catch {
+      return sendJson(res, 400, { error: "invalid_json" });
+    }
+
+    if (req.url === "/v1/chat/completions") {
+      return sendJson(res, 200, noReplyChatCompletion(parsed));
+    }
+
+    if (req.url === "/v1/responses") {
+      return sendJson(res, 200, noReplyResponses(parsed));
+    }
+
+    return sendJson(res, 404, { error: "not_found" });
+  });
+});
+
+server.listen(port, () => {
+  console.log(`[whispergate-no-reply-api] listening on :${port}`);
+});