Add Valkey/Redis cache visualization and API autoloading for graphical inspection

backend/cache-api.cjs

@@ -0,0 +1,29 @@
+// Simple Express API to serve all Redis/Valkey cache keys and values as JSON (CommonJS)
+const express = require('express');
+const Redis = require('ioredis');
+const app = express();
+const redis = new Redis({
+  host: process.env.REDIS_HOST || '127.0.0.1',
+  port: Number(process.env.REDIS_PORT || 6379),
+  password: process.env.REDIS_PASSWORD,
+});
+
+app.get('/api/cache', async (req, res) => {
+  try {
+    const keys = await redis.keys('*');
+    const result = [];
+    for (const key of keys) {
+      let value = await redis.get(key);
+      try { value = JSON.parse(value); } catch {}
+      result.push({ key, value });
+    }
+    res.json(result);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+const port = process.env.CACHE_API_PORT || 3006;
+app.listen(port, () => {
+  console.log(`Cache API running on http://localhost:${port}/api/cache`);
+});