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>

electron/preload.js

@@ -0,0 +1,34 @@
+const { contextBridge, ipcRenderer } = require('electron')
+
+contextBridge.exposeInMainWorld('electronAPI', {
+  // Config
+  getConfig: () => ipcRenderer.invoke('get-config'),
+  saveConfig: (config) => ipcRenderer.invoke('save-config', config),
+
+  // Devices
+  getDevices: () => ipcRenderer.invoke('get-devices'),
+  getWindows: () => ipcRenderer.invoke('get-windows'),
+
+  // Streams
+  startStream: (config) => ipcRenderer.invoke('start-stream', config),
+  stopStream: (id) => ipcRenderer.invoke('stop-stream', id),
+  getActiveStreams: () => ipcRenderer.invoke('get-active-streams'),
+
+  // Tolbek receiver
+  startTolbek: (config) => ipcRenderer.invoke('start-tolbek', config),
+  stopTolbek: () => ipcRenderer.invoke('stop-tolbek'),
+
+  // Window controls
+  minimizeWindow: () => ipcRenderer.invoke('minimize-window'),
+  hideWindow: () => ipcRenderer.invoke('hide-window'),
+  updateTrayCount: (count) => ipcRenderer.send('update-tray-count', count),
+
+  // Event listeners
+  onStreamStatus: (cb) => ipcRenderer.on('stream-status', (_, data) => cb(data)),
+  onStreamLog: (cb) => ipcRenderer.on('stream-log', (_, data) => cb(data)),
+  onStreamError: (cb) => ipcRenderer.on('stream-error', (_, data) => cb(data)),
+  onStreamEnded: (cb) => ipcRenderer.on('stream-ended', (_, data) => cb(data)),
+  onAllStreamsStopped: (cb) => ipcRenderer.on('all-streams-stopped', () => cb()),
+
+  removeAllListeners: (channel) => ipcRenderer.removeAllListeners(channel)
+})