Add automatic PoE power cycling for recovery loop

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Summary

• Adds pluggable PowerController ABC (src/defib/power/base.py) for device power control
• Implements RouterOS API client from scratch (zero deps) with auto-discovery of PoE ports by matching serial device names against switch interface comments
• Integrates power cycling into RecoverySession as optional step before handshake
• Adds --power-cycle flag to defib burn command, configured via DEFIB_POE_* env vars

Tested on real hardware

CRS112-8P-4S PoE switch with two cameras:

• IVGHP203Y-AF on ether3 — power cycled, bootrom 0x20 pattern detected via /dev/uart-IVGHP203Y-AF
• IVG85HG50PYA-S on ether4 — power cycled, bootrom 0x20 pattern detected via /dev/uart-IVG85HG50PYA-S

Usage

export DEFIB_POE_HOST=192.168.88.1
export DEFIB_POE_USER=admin
export DEFIB_POE_PASS=

defib burn -c <chip> -p /dev/uart-IVGHP203Y-AF --power-cycle

Test plan

• 20 unit tests for ABC, RouterOS wire protocol, response parsing, env var factory
• Full test suite passes (275 tests)
• Verified power cycle + bootrom detection on both cameras
• CI green

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