Expand HVAC capability inference from known unit types

[Snuffy2]

Summary

Expand HVAC capability inference to supplement Carrier energy flags with known indoor and outdoor unit-type hints, while keeping the public API unchanged.

What Changed

• Added internal normalization for raw profile unit-type comparisons.
• Added outdoor-unit fallbacks for:
  • multistghp -> heat and cool
  • multistgac -> cool
  • varcaphp -> heat and cool
  • varcapac -> cool
  • ac2stg -> cool
  • ac1stg -> cool
• Added indoor-unit fallbacks for:
  • furnace -> heat
  • fancoil -> fan
• Extended regression coverage for canonical, mixed-case, and whitespace-variant unit-type strings.

Why

Some Carrier installations do not report a capability through energyConfig even when the equipment is known to support it. These unit-type hints provide a conservative supplemental signal without changing the public API surface.

Validation

• ./.venv/bin/pytest
• ./.venv/bin/prek run --all-files

Fixes dahlb/ha_carrier#400

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/carrier_api
system.py					188
Project Total

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