Add Asterisk configuration and diagnostics support

- Updated .env.example to include Asterisk templates path.
- Modified docker-compose.yml to mount the templates directory.
- Enhanced backend Dockerfile to copy templates into the container.
- Introduced Asterisk diagnostics functionality in asterisk_profiles.py, allowing for baseline checks and diagnostics reporting.
- Integrated Asterisk diagnostics into the device diagnostics workflow in graph.py.
- Added formatting for Asterisk baseline drift reports in diagnostic_format.py.
- Updated SKILL.md to document new config baseline drift feature for Asterisk.

This commit enhances the system's capabilities for managing Asterisk configurations and diagnostics, improving overall troubleshooting processes.

templates/asterisk/geneseasx/manifest.yaml

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+# GeneseasX Asterisk golden config baseline
+# Used by asterisk_baseline.py to compare live container config on task runs.
+#
+# Variables use {{NAME}} placeholders — resolved from:
+#   1. This file (defaults)
+#   2. Env ASTERISK_BASELINE_<NAME> (e.g. ASTERISK_BASELINE_ASTERISK_IP)
+#   3. Per-vessel device metadata (future UI fields)
+
+profile: geneseasx
+catalog_keys:
+  - asterisk_geneseasx
+  - asterisk
+
+variables:
+  ASTERISK_IP: "10.20.30.222"
+  PHONE_SUBNET: "192.168.0.0/24"
+  VOIP_SUBNET: "10.20.30.0/24"
+  RTP_START: "10000"
+  RTP_END: "10029"
+
+config_root: /etc/asterisk
+
+files:
+  - path: pjsip.conf
+    description: PJSIP NAT / SDP — critical for registration and one-way audio
+    required_lines:
+      - "local_net={{PHONE_SUBNET}}"
+      - "local_net={{VOIP_SUBNET}}"
+      - "external_media_address={{ASTERISK_IP}}"
+      - "external_signaling_address={{ASTERISK_IP}}"
+
+  - path: rtp.conf
+    description: RTP port range — must align with pfSense pass rules (UDP 10000-10029)
+    required_lines:
+      - "rtpstart={{RTP_START}}"
+      - "rtpend={{RTP_END}}"
+
+  - path: extensions.conf
+    description: Dialplan — trunk patterns and internal routing
+    required_substrings:
+      - "[public]"
+      - "exten => _7"

templates/asterisk/geneseasx/pjsip.conf.snippet

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+; Golden reference snippet — GeneseasX Asterisk PJSIP (not executed; for human review).
+; Live checks use manifest.yaml required_lines against /etc/asterisk/pjsip.conf in container.
+
+[transport-udp]
+type=transport
+protocol=udp
+bind=0.0.0.0:5060
+local_net={{PHONE_SUBNET}}
+local_net={{VOIP_SUBNET}}
+external_media_address={{ASTERISK_IP}}
+external_signaling_address={{ASTERISK_IP}}
+
+; Endpoint includes vary by vessel — verify local_net on transport and per-endpoint if used.