Replace custom setup wizard with Database Manager (like Python Odoo)

Flow now mirrors Python Odoo exactly:
1. Empty DB → /web redirects to /web/database/manager
2. User fills: master_pwd, email (login), password, phone, lang, country, demo
3. Backend creates admin user, company, seeds chart of accounts
4. Auto-login → redirect to /odoo (webclient)

Removed:
- Custom /web/setup wizard
- Auto-seed on startup

Added:
- /web/database/manager (mirrors odoo/addons/web/controllers/database.py)
- /web/database/create (mirrors exp_create_database)
- Auto-login after DB creation with session cookie

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

docker-compose.yml

@@ -12,11 +12,8 @@ services:
       USER: odoo
       PASSWORD: odoo
       ODOO_DB_NAME: odoo
-      ODOO_ADDONS_PATH: /opt/odoo-src/addons,/opt/odoo-src/odoo/addons
-      ODOO_BUILD_DIR: /opt/build/js
-    volumes:
-      - ../odoo:/opt/odoo-src:ro
-      - ./build/js:/opt/build/js:ro
+      ODOO_FRONTEND_DIR: /app/frontend
+      ODOO_BUILD_DIR: /app/build
     restart: unless-stopped
 
   db: