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>

package.json

@@ -21,6 +21,7 @@
     "bcryptjs": "^3.0.2",
     "cheerio": "^1.1.0",
     "next": "^15.3.4",
+    "pg": "^8.16.2",
     "react": "^19.1.0",
     "react-dom": "^19.1.0"
   },