Feature : Collect and analyze power consumption data from Shelly Pro 2PM - #380

[romainantes]

Add Shelly power monitoring tools
Add two scripts under tools/shelly_power/ to collect and analyze power consumption data from a Shelly Gen2 device (local API, no cloud dependency) :

• collect.py queries Switch.GetStatus for each configured channel and appends the results to a CSV file. Intended to run periodically via cron on the Raspberry Pi (e.g. every 10 minutes).

• analyze.py processes the collected CSV and produces a per-channel and combined report including average/peak power, total energy, energy per 24h, and day vs night consumption split. An optional matplotlib chart can be generated with --plot.

Both scripts require no external dependencies beyond the standard library (matplotlib is optional).
A README.md documents usage, cron setup, CSV format, and how to retrieve data from the RPi for local analysis.

Example of plot generated:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.83%. Comparing base (a227753) to head (3d99898).

Additional details and impacted files

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  Coverage    78.83%   78.83%           
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  Files            6        6           
  Lines          841      841           
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  Hits           663      663           
  Misses         178      178           

Flag	Coverage Δ
unittests	78.83% <ø> (ø)

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