feat: initial release — SRT Streamer v1.0.0

Cross-platform Electron + React + FFmpeg desktop app for sending
multiple SRT streams simultaneously.

Features:
- Multiple simultaneous SRT output streams
- Video sources: desktop, window capture, cameras, capture cards
- Audio sources: microphones, system loopback, sound cards
- H.264 encoding with HW acceleration (NVENC/QSV/AMF/VideoToolbox)
- SRT modes: caller / listener / rendezvous
- Frame profile presets (4K, 1080p, 720p, 480p, 360p)
- Tolbek SRT receiver with configurable mode
- System tray: minimize-to-tray, exit confirmation dialog
- Portable build via electron-builder

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,11 @@
+node_modules/
+dist/
+dist-electron/
+ffmpeg-bin/ffmpeg
+ffmpeg-bin/ffmpeg.exe
+ffmpeg-bin/ffprobe
+ffmpeg-bin/ffprobe.exe
+assets/icon.png
+assets/tray-icon.png
+assets/icon.ico
+assets/icon.icns