Frontend updates: caching basic data (json) from CDragon

Implement caching in the patch_detector, consume the cache from API routes in frontend

dev/scripts/fetch-cdragon.js

@@ -0,0 +1,34 @@
+#!/usr/bin/env node
+
+import { spawn } from 'child_process';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+// Cache directory - use dev/cdragon by default
+const cacheDir = process.env.CDRAGON_CACHE_DIR || path.join(__dirname, '..', 'data', 'cdragon');
+
+// Dev MongoDB credentials (matching docker-compose.yml defaults)
+const mongoUser = process.env.MONGO_USER || 'root';
+const mongoPass = process.env.MONGO_PASS || 'password';
+const mongoHost = process.env.MONGO_HOST || 'localhost:27017';
+
+// Run patch_detector with the cache directory and dev MongoDB credentials
+const patchDetector = spawn('npx', ['tsx', '../patch_detector/index.ts'], {
+  cwd: path.join(__dirname, '..'),
+  env: {
+    ...process.env,
+    NODE_ENV: 'development',
+    CDRAGON_CACHE_DIR: cacheDir,
+    MONGO_USER: mongoUser,
+    MONGO_PASS: mongoPass,
+    MONGO_HOST: mongoHost
+  },
+  stdio: 'inherit'
+});
+
+patchDetector.on('close', (code) => {
+  process.exit(code || 0);
+});