refactor(db): consolidate ~20+ databases into 2 (mana_platform + mana_sync)

Mirrors the frontend unification (single IndexedDB) on the backend.
All services now use pgSchema() for isolation within one shared database,
enabling cross-schema JOINs, simplified ops, and zero DB setup for new apps.

- Migrate 7 services from pgTable() to pgSchema(): mana-user (usr),
  mana-media (media), todo, traces, presi, uload, cards
- Update all DATABASE_URLs in .env.development, docker-compose, configs
- Rewrite init-db scripts for 2 databases + 12 schemas
- Rewrite setup-databases.sh for consolidated architecture
- Update shared-drizzle-config default to mana_platform
- Update CLAUDE.md with new database architecture docs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/uload/packages/uload-database/src/index.ts

@@ -22,8 +22,7 @@ let client: ReturnType<typeof postgres> | null = null;
 export function getDb(): ReturnType<typeof drizzle<typeof schema>> {
 	if (!db) {
 		const connectionString =
-			process.env.DATABASE_URL ||
-			'postgresql://uload:uload_dev_password_123@localhost:5432/uload_dev';
+			process.env.DATABASE_URL || 'postgresql://manacore:devpassword@localhost:5432/mana_platform';
 
 		client = postgres(connectionString, {
 			max: 10,