chore(config): add agent skills and project brain documentation

.brain/supabase-schema.md

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+# Supabase Schema
+
+## `companies` (Unternehmen)
+- Repräsentiert die Partner-Unternehmen (Retailer).
+- `id` (UUID, Primary Key)
+- `name` (TEXT)
+- `street`, `zip`, `city`, `email` (Adressdaten)
+
+## `users` (Systembenutzer)
+- Erweitert die Authentifizierungsdaten aus `auth.users`.
+- `id` (UUID, References `auth.users(id)`)
+- `role` (TEXT, standardmäßig `'partner'`, oder `'admin'`)
+- `company_id` (UUID, References `public.companies(id)`)
+
+## `profiles` (Benutzerprofile)
+- Stammdaten der einzelnen Benutzer.
+- `id` (UUID, References `auth.users(id)`)
+- `first_name`, `last_name`, `email` etc.
+
+## `end_customers` (Endkunden)
+- `id` (UUID, Primary Key)
+- `partner_id` (UUID, References `public.companies(id)`)
+- `company_name` (TEXT)
+- `first_name`, `last_name`, `street`, `zip`, `city`, `email`
+- `bank_iban`, `bank_bic`, `bank_name`, `bank_owner`
+- `is_anonymized` (BOOLEAN)
+
+## `products` (Katalogprodukte)
+- `id`, `name`, `base_price`, `tax_rate`, `billing_interval` (`one_time` / `monthly`).
+- `requirements` (UUID[])
+- `exclusions` (UUID[])
+
+## `product_modules` (Zusatzmodule)
+- `id`, `product_id` (References `products`), `name`, `price`, `has_quantity` (BOOLEAN).
+- `requirements` (UUID[])
+- `exclusions` (UUID[])
+
+## `orders` (Bestellungen / Anfragen)
+- `id` (UUID, Primary Key)
+- `user_id` (UUID, References `auth.users(id)`)
+- `order_number` (TEXT)
+- `order_hash` (TEXT)
+- `end_customer_id` (UUID, References `end_customers(id)`)
+- `total_price` (DECIMAL)
+- `customer_data` (JSONB)
+- `order_data` (JSONB)
+- `pdf_url` (TEXT)
+- `status` (TEXT)
+
+## `categories` (Kategorien)
+- Steuert das Layout und Verhalten im Wizard.
+- `id` (UUID, Primary Key)
+- `name` (TEXT)
+- `is_required` (BOOLEAN)
+- `allow_multiselect` (BOOLEAN)
+- `sort_order` (INTEGER)
+- `show_in_branches` (BOOLEAN)
+
+## `settings` (Systemeinstellungen)
+- Globale Shopeinstellungen (SMTP & Lizenzserver).
+- `id` (TEXT, Primary Key, z.B. `'licserver'`, `'smtp'`)
+- `host`, `port`, `secure`, `user`, `pass` (SMTP-Konfiguration)
+- `licserver_base_url`, `licserver_api_key` (CASPOS Lizenzserver-Einstellungen)
+- `updated_at` (TIMESTAMPTZ)