refactor content fetching and embedding processes for improved concurrency and error handling

server.js

@@ -2,6 +2,7 @@ const Fastify = require('fastify');
 const cors = require('@fastify/cors');
 const articleRoutes = require('./src/routes/articles');
 const statusRoutes = require('./src/routes/status');
+const sourcesRoutes = require('./src/routes/sources');
 const config = require('./src/config');
 const { startScheduler } = require('./src/scheduler');
 
@@ -10,6 +11,7 @@ const app = Fastify({ logger: true });
 app.register(cors, { origin: true });
 app.register(articleRoutes);
 app.register(statusRoutes);
+app.register(sourcesRoutes);
 
 app.get('/', async () => ({ ok: true }));