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>

CLAUDE.md

@@ -101,6 +101,17 @@ The app uses a sophisticated dual integration approach:
 1. **WebSocket Connection**: Direct OBS control using obs-websocket-js with persistent connection management
 2. **Text File System**: Each screen position has a corresponding text file that OBS Source Switcher monitors
 
+**Required OBS Source Switchers** (must be created with these exact names):
+- `ss_large` - Large screen source switcher
+- `ss_left` - Left screen source switcher  
+- `ss_right` - Right screen source switcher
+- `ss_top_left` - Top left screen source switcher
+- `ss_top_right` - Top right screen source switcher
+- `ss_bottom_left` - Bottom left screen source switcher
+- `ss_bottom_right` - Bottom right screen source switcher
+
+See [OBS Setup Guide](./docs/OBS_SETUP.md) for detailed configuration instructions.
+
 **Source Control Workflow**:
 1. User selects stream in React UI
 2. API writes source name to position-specific text file (e.g., `large.txt`, `left.txt`)