🔧 chore(mana-notify): disable email notifications by default

Email alerts were causing too many notifications. Changed default
from true to false so new users won't receive email notifications
unless explicitly enabled. Push notifications remain enabled.

services/mana-notify/src/db/schema/preferences.schema.ts

@@ -19,7 +19,7 @@ export const preferences = notifySchema.table(
 		userId: text('user_id').notNull(),
 
 		// Global settings
-		emailEnabled: boolean('email_enabled').notNull().default(true),
+		emailEnabled: boolean('email_enabled').notNull().default(false),
 		pushEnabled: boolean('push_enabled').notNull().default(true),
 
 		// Quiet hours

services/mana-notify/src/preferences/preferences.service.ts

@@ -40,7 +40,7 @@ export class PreferencesService {
 			.insert(preferences)
 			.values({
 				userId,
-				emailEnabled: true,
+				emailEnabled: false,
 				pushEnabled: true,
 				quietHoursEnabled: false,
 				timezone: 'Europe/Berlin',