Add secrets.yaml example template

secrets.yaml.example

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+# OPNsense API Configuration
+# Copy this file to secrets.yaml and fill in your actual credentials
+# NEVER commit secrets.yaml to git!
+
+# OPNsense API Credentials
+# Generate these in OPNsense: System > Access > Users > Edit User > API Keys
+opnsense_api_key: "your_api_key_here"
+opnsense_api_secret: "your_api_secret_here"
+
+# OPNsense Connection
+opnsense_host: "10.0.0.254"
+opnsense_url: "https://10.0.0.254"
+
+# Required API Permissions:
+# - Firewall: Aliases (Read/Write)
+# - Firewall: Filter (Read/Write)
+# - Diagnostics: Interface (Read)