Add multiple entries per day, user management, reminders, and AI reflections

- Multiple entries per day: Home page now starts fresh, Save & New button
- Admin user management: Add/delete users, reset passwords, toggle admin
- Daily reminders: Browser notifications at configurable time
- AI reflections: Generate insights from entries using Claude API
- Remove cloud sync placeholder (already have user accounts)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

drizzle/0002_windy_rawhide_kid.sql

@@ -0,0 +1,3 @@
+ALTER TABLE `users` ADD `reminder_enabled` integer DEFAULT 0 NOT NULL;--> statement-breakpoint
+ALTER TABLE `users` ADD `reminder_time` text;--> statement-breakpoint
+ALTER TABLE `users` ADD `llm_api_key` text;