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>

docs/MANADECK_POSTGRES_MIGRATION.md

@@ -246,7 +246,7 @@ import { pgTable, uuid, varchar, text, boolean, timestamp, jsonb } from 'drizzle
 
 export const decks = pgTable('decks', {
 	id: uuid('id').primaryKey().defaultRandom(),
-	userId: uuid('user_id').notNull(),
+	userId: text('user_id').notNull(),  // text, not uuid - Better Auth uses non-UUID IDs
 	title: varchar('title', { length: 255 }).notNull(),
 	description: text('description'),
 	coverImageUrl: text('cover_image_url'),