Initial commit: Signal video-grabber bot

Group-chat bot that downloads videos from X/Instagram/YouTube/TikTok links
via yt-dlp and posts them back, plus /speed and /rev video toys.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

signal-bot.service.example

@@ -0,0 +1,20 @@
+[Unit]
+Description=Signal Twitter Video Bot
+After=network.target docker.service
+Requires=docker.service
+
+[Service]
+Type=simple
+User=YOUR_USER
+WorkingDirectory=/home/YOUR_USER/signal-bot
+# The bot's own Signal number (the account it's linked to as a device).
+Environment=SIGNAL_PHONE_NUMBER=+15551234567
+Environment=SIGNAL_SERVICE=127.0.0.1:8080
+# Optional: comma-separated numbers allowed to run /cookies (admin command).
+# Environment=BOT_ADMINS=+15551234567
+ExecStart=/home/YOUR_USER/signal-bot/venv/bin/python bot.py
+Restart=on-failure
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target