feat(mac-mini): add notification system for health checks

- Update health-check.sh with Telegram, Email, and ntfy notification functions
- Add notifications.env.example template for configuration
- Add setup-notifications.sh interactive setup script

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/mac-mini/notifications.env.example

@@ -0,0 +1,36 @@
+# ManaCore Notification Configuration
+# Copy this file to the project root as .env.notifications
+# cp scripts/mac-mini/notifications.env.example .env.notifications
+
+# ============================================
+# Telegram Bot
+# ============================================
+# 1. Message @BotFather on Telegram
+# 2. Send /newbot and follow instructions
+# 3. Copy the bot token here
+TELEGRAM_BOT_TOKEN=
+
+# To get your Chat ID:
+# 1. Message your bot
+# 2. Visit: https://api.telegram.org/bot<TOKEN>/getUpdates
+# 3. Find "chat":{"id": YOUR_CHAT_ID}
+TELEGRAM_CHAT_ID=
+
+# ============================================
+# Email (via msmtp)
+# ============================================
+# Email address to send alerts to
+EMAIL_TO=
+
+# From address (optional)
+EMAIL_FROM=manacore@mana.how
+
+# Note: For email to work, install and configure msmtp on Mac Mini:
+#   brew install msmtp
+#   Create ~/.msmtprc with your SMTP settings (see below)
+
+# ============================================
+# ntfy.sh (optional, simple push notifications)
+# ============================================
+# Create a topic at ntfy.sh and subscribe in the app
+NTFY_TOPIC=