Add OpenAPI docs, frontend, migrations, and API updates

- OpenAPI: add missing endpoints (add-from-url, subscriptions, public availability)
- OpenAPI: CalendarSubscription schema, Subscriptions tag
- Frontend app
- Migrations: count_for_availability, subscriptions_sync, user_preferences, calendar_settings
- Config, rate limit, auth, calendar, booking, ICS, availability, user service updates

Made-with: Cursor

sqlc/queries/users.sql

@@ -4,21 +4,36 @@ VALUES ($1, $2, $3, $4)
 RETURNING id, email, password_hash, timezone, is_active, created_at, updated_at;
 
 -- name: GetUserByID :one
-SELECT id, email, password_hash, timezone, is_active, created_at, updated_at
+SELECT id, email, password_hash, timezone, is_active, week_start_day, date_format, time_format,
+       default_event_duration_minutes, default_reminder_minutes, show_weekends,
+       working_hours_start, working_hours_end, notifications_email, created_at, updated_at
 FROM users
 WHERE id = $1 AND deleted_at IS NULL;
 
 -- name: GetUserByEmail :one
-SELECT id, email, password_hash, timezone, is_active, created_at, updated_at
+SELECT id, email, password_hash, timezone, is_active, week_start_day, date_format, time_format,
+       default_event_duration_minutes, default_reminder_minutes, show_weekends,
+       working_hours_start, working_hours_end, notifications_email, created_at, updated_at
 FROM users
 WHERE email = $1 AND deleted_at IS NULL;
 
 -- name: UpdateUser :one
 UPDATE users
 SET timezone = COALESCE(sqlc.narg('timezone')::TEXT, timezone),
+    week_start_day = COALESCE(sqlc.narg('week_start_day')::SMALLINT, week_start_day),
+    date_format = COALESCE(sqlc.narg('date_format')::TEXT, date_format),
+    time_format = COALESCE(sqlc.narg('time_format')::TEXT, time_format),
+    default_event_duration_minutes = COALESCE(sqlc.narg('default_event_duration_minutes')::INTEGER, default_event_duration_minutes),
+    default_reminder_minutes = COALESCE(sqlc.narg('default_reminder_minutes')::INTEGER, default_reminder_minutes),
+    show_weekends = COALESCE(sqlc.narg('show_weekends')::BOOLEAN, show_weekends),
+    working_hours_start = COALESCE(sqlc.narg('working_hours_start')::TEXT, working_hours_start),
+    working_hours_end = COALESCE(sqlc.narg('working_hours_end')::TEXT, working_hours_end),
+    notifications_email = COALESCE(sqlc.narg('notifications_email')::BOOLEAN, notifications_email),
     updated_at = now()
 WHERE id = @id AND deleted_at IS NULL
-RETURNING id, email, password_hash, timezone, is_active, created_at, updated_at;
+RETURNING id, email, password_hash, timezone, is_active, week_start_day, date_format, time_format,
+          default_event_duration_minutes, default_reminder_minutes, show_weekends,
+          working_hours_start, working_hours_end, notifications_email, created_at, updated_at;
 
 -- name: SoftDeleteUser :exec
 UPDATE users SET deleted_at = now(), is_active = false, updated_at = now()