Reconcile the accepted safe federation helper with E2EE integration hardening and complete PIN-based encrypted DMs

Hop-State: A_06FPC0CGS3F7SJG3BGW0YF0
Hop-Proposal: R_06FPC0BK6YEV7XASNM7C908
Hop-Task: T_06FPAWA3279RBMJAR0BHM10
Hop-Attempt: AT_06FPBZWSBFTB9B5YH9JY9QR

src/app/api/swarm/announce/route.ts

@@ -33,7 +33,7 @@ const announcementSchema = z.object({
   userCount: z.number().optional(),
   postCount: z.number().optional(),
   isNsfw: z.boolean().optional(),
-  capabilities: z.array(z.enum(['handles', 'gossip', 'relay', 'search', 'interactions'])).optional(),
+  capabilities: z.array(z.enum(['handles', 'gossip', 'relay', 'search', 'interactions', 'e2ee_dm_v1'])).optional(),
   timestamp: z.string().optional(),
 });