feat: AI Kurzy module, project/service documents, services SQL import

- Add AI Kurzy module with courses, participants, and registrations management
- Add project documents and service documents features
- Add service folders for document organization
- Add SQL import queries for services from firmy.slovensko.ai
- Update todo notifications and group messaging
- Various API improvements and bug fixes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

sql/README.md

@@ -0,0 +1,46 @@
+# SQL Migration Scripts
+
+## Pouzitie na Coolify
+
+### 1. Pripojenie k databaze cez terminal
+
+```bash
+# Na Coolify serveri najdi PostgreSQL container a pripoj sa
+docker exec -it <postgres_container_id> psql -U <username> -d <database>
+
+# Alebo ak mas pristup cez SSH:
+psql -h localhost -U <username> -d <database>
+```
+
+### 2. Poradie spustenia scriptov
+
+**DOLEZITE: Spusti scripty v tomto poradi!**
+
+```sql
+-- 1. Najprv schema migration (vytvori nove tabulky a stlpce)
+\i /path/to/01_schema_migration.sql
+
+-- 2. Potom AI Kurzy data (vlozi kurzy a ucastnikov)
+\i /path/to/02_ai_kurzy_data.sql
+
+-- 3. Volitelne: Cleanup existujucich dat (POZOR - maze data!)
+\i /path/to/03_cleanup_data.sql
+```
+
+### 3. Alternativne - copy/paste
+
+Mozes tiez otvorit subory a copy/paste obsah priamo do psql terminalu.
+
+### Popis suborov
+
+| Subor | Popis |
+|-------|-------|
+| `01_schema_migration.sql` | Vytvori vsetky nove tabulky (chat groups, push notifications, AI kurzy, atd.) a prida nove stlpce do existujucich tabuliek |
+| `02_ai_kurzy_data.sql` | Importuje kurzy a ucastnikov z CSV - 6 kurzov, 9 ucastnikov |
+| `03_cleanup_data.sql` | Vymaze test data z todos, companies, projects, notes, events, messages |
+
+### Poznamky
+
+- `01_schema_migration.sql` je bezpecny - pouziva `IF NOT EXISTS` takze nevytvori duplicity
+- `02_ai_kurzy_data.sql` najprv ZMAZE existujuce AI kurzy data!
+- `03_cleanup_data.sql` ZMAZE data! Pouzi opatrne!