Add battery-storage device constants - gladys-zendure external

[Terdious]

Mirror of the battery-storage category added to Gladys core (GladysAssistant/Gladys#2682): the battery-storage category with battery-level, charge-power, discharge-power, charge-index, discharge-index and battery-energy-remaining types, in lib/device-constants.js and index.d.ts, with test coverage.

Needed by external integrations reporting battery storage telemetry, starting with the Zendure integration (Terdious/gladys-zendure).

Claude-Session: https://claude.ai/code/session_012157sX3FKhVYmndWLJdhfo

Summary by CodeRabbit

• New Features
  • Added a new battery-storage device feature category.
  • Introduced new battery-storage feature types for battery state of charge, charge/discharge power, cumulative charged/discharged energy indices, and remaining stored battery energy.
• Tests
  • Updated canonical constant string assertions to include the new battery-storage category and related feature-type identifiers.

[coderabbitai]

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📝 Walkthrough

Walkthrough

Adds a BATTERY_STORAGE device-feature category and feature-type group to runtime constants and TypeScript declarations, with tests covering battery level, power-flow, cumulative-energy, and remaining-energy canonical strings.

Changes

Battery storage constants

Layer / File(s)	Summary
Define and validate battery storage constants index.d.ts, lib/device-constants.js, test/device-constants.test.js	Adds the battery-storage category and battery level, power-flow, cumulative-energy, and remaining-energy feature types to runtime and TypeScript exports, with canonical string assertions.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Poem

A rabbit hops through storage bright,
With battery levels tucked in tight.
Power flows and energies align,
Typed and tested by sunlight divine.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding battery-storage device constants for the Zendure integration.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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