Fix validation error when battery_charge/discharge_power_curve is set to "auto"

[Copilot]

Setting battery_charge_power_curve: auto or battery_discharge_power_curve: auto in apps.yaml triggers validation errors because the schema only permits int_float_dict, despite "auto" being a valid runtime value that enables auto-detection.

Changes

• config.py: Added "or_auto": True to the APPS_SCHEMA entries for both battery_charge_power_curve and battery_discharge_power_curve
• predbat.py: Updated int_float_dict validation to accept "auto" when or_auto is set in the spec
• tests/test_battery_curve_keys.py: Added test_validate_config_auto_curve to assert that setting both curves to "auto" introduces no additional validation errors

# Previously caused:
# Warn: Validation of apps.yaml found configuration item 'battery_charge_power_curve'
#       is not of type 'int_float_dict' value was auto
battery_charge_power_curve: auto
battery_discharge_power_curve: auto

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[Copilot]

Pull request overview

Fixes a config validation mismatch where battery_charge_power_curve: auto / battery_discharge_power_curve: auto are valid runtime values (triggering auto-detection), but previously failed schema validation.

Changes:

• Allow "auto" as an alternative to int_float_dict for the two battery power curve config keys via a schema flag.
• Extend validate_config()’s int_float_dict validation to accept "auto" when explicitly enabled by the schema.
• Add a regression test ensuring both curve settings can be set to "auto" without increasing validation errors.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
apps/predbat/config.py	Marks both battery power curve config keys as allowing "auto" during validation.
apps/predbat/predbat.py	Updates int_float_dict validation to accept "auto" when spec["or_auto"] is set.
apps/predbat/tests/test_battery_curve_keys.py	Adds a test to prevent regressions for "auto" curve validation.