feat(swarm): Implement decentralized node discovery and content federation system

- Add swarm node registry with discovery, gossip, and timeline synchronization
- Implement database schema for swarm nodes, seeds, and sync logs with proper indexing
- Create swarm API endpoints for node discovery, gossip protocol, timeline sharing, and announcements
- Add content moderation features with NSFW flagging and muted nodes support
- Implement user settings pages for content filtering and node moderation
- Add background scheduler for automated swarm synchronization and node health checks
- Create .well-known endpoint for swarm protocol discovery
- Remove legacy bot-cron.ts in favor of integrated scheduler system
- Add user account NSFW preferences and age verification tracking
- Update database schema with swarm-related tables and user moderation fields
- Enhance post and user components to support federated content display
- Add instrumentation for monitoring swarm operations and node health

src/instrumentation.ts

@@ -0,0 +1,19 @@
+/**
+ * Next.js Instrumentation
+ * 
+ * This file runs when the Next.js server starts.
+ * We use it to initialize background tasks like:
+ * - Swarm announcement (on startup)
+ * - Bot cron (every 1 minute)
+ * - Swarm gossip (every 5 minutes)
+ * 
+ * This eliminates the need for a separate cron process.
+ */
+
+export async function register() {
+  // Only run on the server (not during build or in edge runtime)
+  if (process.env.NEXT_RUNTIME === 'nodejs') {
+    const { startBackgroundTasks } = await import('@/lib/background/scheduler');
+    startBackgroundTasks();
+  }
+}