feat: add user preferences for online status and read receipts with real-time updates

- Introduced `showOnlineStatus` and `showReadReceipts` fields in the user schema and API.
- Integrated real-time status broadcasting in `UsersService` via `EventsGateway`.
- Updated repository and frontend user types to align with new fields.
- Enhanced user update handling to support dynamic preference changes for online status.

backend/src/database/schemas/users.ts

@@ -36,6 +36,8 @@ export const users = pgTable(
 		// Sécurité
 		twoFactorSecret: pgpEncrypted("two_factor_secret"),
 		isTwoFactorEnabled: boolean("is_two_factor_enabled").notNull().default(false),
+		showOnlineStatus: boolean("show_online_status").notNull().default(true),
+		showReadReceipts: boolean("show_read_receipts").notNull().default(true),
 
 		// RGPD & Conformité
 		termsVersion: varchar("terms_version", { length: 16 }), // Version des CGU acceptées