fix(db): use TEXT for user_id columns across entire codebase

Better Auth generates non-UUID user IDs (32-char base62 format like
'otUe1YrfENPdHnrF3g1vSBfpkQfambCZ'). Changed all `uuid('user_id')` to
`text('user_id')` in Drizzle schemas for consistency with auth system.

Affected packages/apps:
- apps/calendar, clock, picture, zitare
- games/figgos, voxelava
- packages/manadeck-database, news-database, uload-database
- services/mana-core-auth (feedback schema)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

packages/manadeck-database/src/schema/userStats.ts

@@ -1,9 +1,9 @@
-import { pgTable, uuid, integer, decimal, date, timestamp, index } from 'drizzle-orm/pg-core';
+import { pgTable, text, integer, decimal, date, timestamp, index } from 'drizzle-orm/pg-core';
 
 export const userStats = pgTable(
 	'user_stats',
 	{
-		userId: uuid('user_id').primaryKey(),
+		userId: text('user_id').primaryKey(),
 		totalWins: integer('total_wins').default(0).notNull(),
 		totalSessions: integer('total_sessions').default(0).notNull(),
 		totalCardsStudied: integer('total_cards_studied').default(0).notNull(),