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>

services/mana-user/src/db/schema/index.ts

@@ -1,3 +1,4 @@
+export * from './schema';
 export * from './tag-groups';
 export * from './tags';
 export * from './tag-links';

services/mana-user/src/db/schema/schema.ts

@@ -0,0 +1,3 @@
+import { pgSchema } from 'drizzle-orm/pg-core';
+
+export const usrSchema = pgSchema('usr');

services/mana-user/src/db/schema/settings.ts

@@ -1,6 +1,7 @@
-import { pgTable, text, jsonb, timestamp } from 'drizzle-orm/pg-core';
+import { text, jsonb, timestamp } from 'drizzle-orm/pg-core';
+import { usrSchema } from './schema';
 
-export const userSettings = pgTable('user_settings', {
+export const userSettings = usrSchema.table('user_settings', {
 	userId: text('user_id').primaryKey(),
 	globalSettings: jsonb('global_settings')
 		.default({

services/mana-user/src/db/schema/tag-groups.ts

@@ -1,15 +1,7 @@
-import {
-	pgTable,
-	varchar,
-	text,
-	uuid,
-	timestamp,
-	index,
-	unique,
-	integer,
-} from 'drizzle-orm/pg-core';
+import { varchar, text, uuid, timestamp, index, unique, integer } from 'drizzle-orm/pg-core';
+import { usrSchema } from './schema';
 
-export const tagGroups = pgTable(
+export const tagGroups = usrSchema.table(
 	'tag_groups',
 	{
 		id: uuid('id').primaryKey().defaultRandom(),

services/mana-user/src/db/schema/tag-links.ts

@@ -1,7 +1,8 @@
-import { pgTable, varchar, text, uuid, timestamp, index, unique } from 'drizzle-orm/pg-core';
+import { varchar, text, uuid, timestamp, index, unique } from 'drizzle-orm/pg-core';
+import { usrSchema } from './schema';
 import { tags } from './tags';
 
-export const tagLinks = pgTable(
+export const tagLinks = usrSchema.table(
 	'tag_links',
 	{
 		id: uuid('id').primaryKey().defaultRandom(),

services/mana-user/src/db/schema/tags.ts

@@ -1,16 +1,8 @@
-import {
-	pgTable,
-	varchar,
-	text,
-	uuid,
-	timestamp,
-	index,
-	unique,
-	integer,
-} from 'drizzle-orm/pg-core';
+import { varchar, text, uuid, timestamp, index, unique, integer } from 'drizzle-orm/pg-core';
+import { usrSchema } from './schema';
 import { tagGroups } from './tag-groups';
 
-export const tags = pgTable(
+export const tags = usrSchema.table(
 	'tags',
 	{
 		id: uuid('id').primaryKey().defaultRandom(),