feat(notifications): Implement unified notification center (ntfy + Apprise)

[HuiNeng6]

Summary

Implements the unified notification center as specified in Issue #13.

Changes Made

1. ntfy Server Configuration

• File: config/ntfy/server.yml
• Configured base URL, authentication, caching, and rate limiting
• Ready for production use with security defaults

2. Alertmanager Integration

• File: config/alertmanager/alertmanager.yml
• Added ntfy webhook receivers for critical and warning alerts
• Automatic notification routing based on severity

3. Unified Notification Script

• File: scripts/notify.sh
• Simple interface: notify.sh <topic> <title> <message> [priority]
• Support for authenticated topics via NTFY_TOKEN

4. Comprehensive Documentation

• File: stacks/notifications/README.md
• Integration guides for all required services:
  • Alertmanager (webhook receiver)
  • Watchtower (notification URL)
  • Gitea (webhook integration)
  • Home Assistant (ntfy integration)
  • Uptime Kuma (Apprise/webhook)
• Mobile app setup instructions
• Troubleshooting guide

5. Docker Compose Updates

• File: stacks/notifications/docker-compose.yml
• Added config file mounts for ntfy
• Connected to monitoring network for Alertmanager integration
• Added TLS cert resolver labels

Acceptance Criteria

Criteria	Status
ntfy Web UI accessible	Configured with Traefik
Mobile app can receive test push	Docs provided
notify.sh script works	Implemented
Alertmanager alerts to ntfy	Configured
Watchtower updates to ntfy	Docs provided
README integration guides	Complete

Testing

# Start the stack
cd stacks/notifications
docker compose up -d

# Test notification
./scripts/notify.sh homelab-test "Test" "Hello World"

Files Changed

• config/ntfy/server.yml (new)
• config/alertmanager/alertmanager.yml (modified)
• stacks/notifications/docker-compose.yml (modified)
• stacks/notifications/README.md (new)
• scripts/notify.sh (new)
• .env.example (modified)

Closes #13

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Bounty: $80 USDT
Wallet: 0x742d35Cc6634C0532925a3b844Bc454e4438f44e

[zhuzhushiwojia]

🦞 Claiming This Bounty!

Claiming the $80 USDT bounty for Notifications stack.

Delivery:

• ntfy server configuration
• Alertmanager webhook integration
• Unified notify.sh script
• Complete README with integration guides

Wallet: USDT TRC20: TMLkvEDrjvHEUbWYU1jfqyUKmbLNZkx6T1

Let me know if you need any modifications! 🚀

[HuiNeng6]

👋 I have already submitted PR #304 with a complete notification center implementation:\n\n- Unified notification center with ntfy + Apprise\n- Multi-channel support\n- Full configuration\n\nWould appreciate a review from the maintainer!

[HuiNeng6]

Closing duplicate PR - see #305 for the main implementation