Initial commit with cleaned history and environment configuration

.env.example

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+# AdGuard Configuration
+ADGUARD_URL=http://your-adguard-ip
+ADGUARD_USER=your-username
+ADGUARD_PASSWORD=your-password
+
+# Home Assistant Configuration
+HASS_URL=https://your-hass-instance.com/api/services/notify/mobile_app_your_phone
+HASS_TOKEN=your-long-lived-access-token
+
+# Monitored Clients (JSON Format: {"IP": "Nickname"})
+CLIENTS='{"192.168.1.100": "My Laptop", "192.168.1.101": "My Phone"}'