Add OBS group management feature and documentation

- Add group_name column to teams table for mapping teams to OBS groups
- Create API endpoints for group creation (/api/createGroup) and bulk sync (/api/syncGroups)
- Update teams UI with group status display and creation buttons
- Implement automatic group assignment when adding streams
- Add comprehensive OBS setup documentation (docs/OBS_SETUP.md)
- Fix team list spacing issue with explicit margins
- Update OBS client with group management functions
- Add database migration script for existing deployments

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

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

lib/security.ts

@@ -18,7 +18,15 @@ export function isValidUrl(url: string): boolean {
 }
 
 export function isPositiveInteger(value: unknown): value is number {
-  return Number.isInteger(value) && value > 0;
+  return Number.isInteger(value) && Number(value) > 0;
+}
+
+export function validateInteger(value: unknown): number | null {
+  const num = Number(value);
+  if (Number.isInteger(num) && num > 0) {
+    return num;
+  }
+  return null;
 }
 
 // String sanitization