feat(auth): Integrate Cloudflare Turnstile bot protection and enhance swarm tracking

- Add Cloudflare Turnstile integration for login and registration forms
- Create turnstile verification utility with server-side token validation
- Add turnstile_site_key and turnstile_secret_key fields to nodes table
- Implement admin panel UI for configuring Turnstile keys in settings
- Update login and register API routes to verify Turnstile tokens
- Expose turnstile_site_key via GET /api/node endpoint for frontend
- Add admin endpoint to save and update Turnstile configuration
- Create remote_likes and remote_reposts tables for federated interaction tracking
- Add swarm reply metadata fields (swarm_reply_to_id, swarm_reply_to_content, swarm_reply_to_author) to posts table
- Add comprehensive TURNSTILE_SETUP.md documentation with setup instructions and security notes
- Create database migration 0007 with schema updates and indexes
- Protects against bot registrations and automated attacks on federated nodes

src/db/schema.ts

@@ -19,6 +19,9 @@ export const nodes = pgTable('nodes', {
   publicKey: text('public_key'),
   // NSFW settings
   isNsfw: boolean('is_nsfw').default(false).notNull(), // Entire node is NSFW
+  // Cloudflare Turnstile settings
+  turnstileSiteKey: text('turnstile_site_key'),
+  turnstileSecretKey: text('turnstile_secret_key'),
   createdAt: timestamp('created_at').defaultNow().notNull(),
   updatedAt: timestamp('updated_at').defaultNow().notNull(),
 });