添加valkey support

server/cache.js

@@ -0,0 +1,59 @@
+const Redis = require('ioredis');
+
+const host = process.env.VALKEY_HOST || 'localhost';
+const port = parseInt(process.env.VALKEY_PORT) || 6379;
+const password = process.env.VALKEY_PASSWORD || undefined;
+const db = parseInt(process.env.VALKEY_DB) || 0;
+const ttl = parseInt(process.env.VALKEY_TTL) || 30;
+
+let redis = null;
+
+try {
+  redis = new Redis({
+    host,
+    port,
+    password,
+    db,
+    lazyConnect: true,
+    maxRetriesPerRequest: 1
+  });
+
+  redis.on('error', (err) => {
+    // Fail silently after one retry, we just won't cache
+    console.warn('[Cache] Valkey connection failed, caching disabled:', err.message);
+  });
+} catch (err) {
+  console.warn('[Cache] Valkey init failed:', err.message);
+}
+
+const cache = {
+  async get(key) {
+    if (!redis) return null;
+    try {
+      const data = await redis.get(key);
+      return data ? JSON.parse(data) : null;
+    } catch (e) {
+      return null;
+    }
+  },
+
+  async set(key, value, customTtl = ttl) {
+    if (!redis) return;
+    try {
+      await redis.set(key, JSON.stringify(value), 'EX', customTtl);
+    } catch (e) {
+      // ignore
+    }
+  },
+
+  async del(key) {
+    if (!redis) return;
+    try {
+      await redis.del(key);
+    } catch (e) {
+      // ignore
+    }
+  }
+};
+
+module.exports = cache;