Implement team name text overlays with refactored group structure

- Add createTextSource function with automatic OBS text input detection
- Implement createStreamGroup to create groups within team scenes instead of separate scenes
- Add team name text overlays positioned at top-left of each stream
- Refactor stream switching to use stream group names for cleaner organization
- Update setActive API to write stream group names to files
- Fix getActive API to return correct screen position data
- Improve team UUID assignment when adding streams
- Remove manage streams section from home page for cleaner UI
- Add vertical spacing to streams list to match teams page
- Support dynamic text input kinds (text_ft2_source_v2, text_gdiplus, etc.)

This creates a much cleaner OBS structure with 10 team scenes containing grouped
stream sources rather than 200+ individual stream scenes, while adding team
name text overlays for better stream identification.

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

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

app/streams/page.tsx

@@ -289,7 +289,7 @@ export default function AddStream() {
             {streams.map((stream) => {
               const team = teams.find(t => t.id === stream.team_id);
               return (
-                <div key={stream.id} className="glass p-4">
+                <div key={stream.id} className="glass p-4 mb-4">
                   <div className="flex items-center justify-between">
                     <div className="flex items-center">
                       <div