Remove Serbian colors including Braon from database

- Remove Serbian color entries from schema.sql
- Add migration to delete Serbian colors from existing databases
- Add migration runner scripts for easier database updates
- Install pg package for PostgreSQL client support

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: DaX <noreply@anthropic.com>

database/schema.sql

@@ -51,16 +51,4 @@ CREATE TRIGGER update_filaments_updated_at BEFORE UPDATE
 CREATE TRIGGER update_colors_updated_at BEFORE UPDATE
     ON colors FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
 
--- Insert default colors from legacy data
-INSERT INTO colors (name, hex) VALUES
-  ('Crna', '#000000'),
-  ('Bela', '#FFFFFF'),
-  ('Plava', '#0000FF'),
-  ('Crvena', '#FF0000'),
-  ('Zelena', '#00FF00'),
-  ('Žuta', '#FFFF00'),
-  ('Narandžasta', '#FFA500'),
-  ('Ljubičasta', '#800080'),
-  ('Siva', '#808080'),
-  ('Braon', '#A52A2A')
-ON CONFLICT (name) DO NOTHING;
+-- Default colors are now inserted by Bambu Lab colors migration