feat: port quality, escalation, KB version, site-map KB, experiments and metrics

bridge/src/server.js

@@ -7,6 +7,7 @@ const { createTools, resolveSiteProfile } = require('./tools');
 const { createIdentity } = require('./identity');
 const { createLibreDeskWebhook } = require('./libredesk-webhook');
 const { createAgent } = require('./agent');
+const prom = require('./prom');
 const { ToolError } = require('./errors');
 
 const MAX_BODY_BYTES = 256 * 1024;
@@ -113,6 +114,14 @@ function createServer(options = {}) {
         });
       }
 
+      // GET /metrics — Prometheus 文本指标（默认仅内网/LAN 暴露）
+      if (req.method === 'GET' && url === '/metrics') {
+        const body = prom.render();
+        res.writeHead(200, { 'content-type': 'text/plain; version=0.0.4; charset=utf-8', 'content-length': Buffer.byteLength(body) });
+        res.end(body);
+        return;
+      }
+
       // POST /libredesk/webhook — 方案 A：LibreDesk 消息事件进入 bridge（HMAC 验签）
       if (req.method === 'POST' && url === '/libredesk/webhook') {
         const raw = await readRawBody(req);