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>

assets/create-placeholder-icons.js

@@ -0,0 +1,72 @@
+/**
+ * Creates minimal placeholder PNG icons without any dependencies.
+ * Run: node assets/create-placeholder-icons.js
+ */
+const fs = require('fs')
+const path = require('path')
+
+// Minimal valid 16x16 PNG (dark blue background)
+function createSimplePng(size) {
+  // Use a canvas-like approach with raw PNG data
+  // This creates a simple colored square PNG
+  const { createCanvas } = (() => {
+    try { return require('canvas') } catch { return null }
+  })() || {}
+
+  if (createCanvas) {
+    const canvas = createCanvas(size, size)
+    const ctx = canvas.getContext('2d')
+
+    // Background
+    ctx.fillStyle = '#1a1a2e'
+    const r = size * 0.19
+    ctx.beginPath()
+    ctx.moveTo(r, 0)
+    ctx.lineTo(size - r, 0)
+    ctx.quadraticCurveTo(size, 0, size, r)
+    ctx.lineTo(size, size - r)
+    ctx.quadraticCurveTo(size, size, size - r, size)
+    ctx.lineTo(r, size)
+    ctx.quadraticCurveTo(0, size, 0, size - r)
+    ctx.lineTo(0, r)
+    ctx.quadraticCurveTo(0, 0, r, 0)
+    ctx.closePath()
+    ctx.fill()
+
+    // Play triangle
+    const cx = size / 2, cy = size / 2
+    const s = size * 0.3
+    ctx.fillStyle = '#4f8ef7'
+    ctx.beginPath()
+    ctx.moveTo(cx - s * 0.5, cy - s * 0.6)
+    ctx.lineTo(cx + s * 0.7, cy)
+    ctx.lineTo(cx - s * 0.5, cy + s * 0.6)
+    ctx.closePath()
+    ctx.fill()
+
+    // Red dot
+    ctx.fillStyle = '#ef4444'
+    ctx.beginPath()
+    ctx.arc(size * 0.75, size * 0.25, size * 0.1, 0, Math.PI * 2)
+    ctx.fill()
+
+    return canvas.toBuffer('image/png')
+  }
+
+  // Fallback: minimal 1x1 PNG
+  return Buffer.from(
+    '89504e470d0a1a0a0000000d4948445200000001000000010802000000' +
+    '9001' + '2e00000000c4944415408d7626060600000000200014fd7181000000049454e44ae426082', 'hex'
+  )
+}
+
+const sizes = [
+  { name: 'icon.png', size: 512 },
+  { name: 'tray-icon.png', size: 32 }
+]
+
+for (const { name, size } of sizes) {
+  const buf = createSimplePng(size)
+  fs.writeFileSync(path.join(__dirname, name), buf)
+  console.log(`Created ${name}`)
+}