feat: Add inverter_limit_export to cap discharge rate during forced export only

[Copilot]

inverter_limit_discharge caps discharge globally, including ECO mode. This adds inverter_limit_export to cap discharge rate exclusively during forced export windows while leaving ECO mode discharge unaffected.

New config option

inverter_limit_export:
  - 2000  # Watts; one entry per inverter

Defaults to inverter_limit_discharge (or inverter maximum) if not set.

Changes

• config.py: New inverter_limit_export schema entry (per-inverter sensor list, integer, Watts)
• inverter.py: Reads inverter_limit_export, stores as battery_rate_max_export (defaults to inverter_limit_discharge)
• execute.py: Accumulates battery_rate_max_export across inverters; uses it (instead of battery_rate_max_discharge) when calling adjust_discharge_rate during forced export
• prediction.py: Uses battery_rate_max_export as the discharge rate setting during export windows so the plan model matches actual behaviour; ECO-mode discharge continues to use battery_rate_max_discharge
• predbat.py: Initialises battery_rate_max_export = 0 in reset()
• Tests: Updated test_infra.py and test_execute.py to propagate the new field; added discharge_limit_export execute test asserting the rate is capped to the export limit rather than the full discharge limit
• docs/apps-yaml.md: Documents the new option

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• api.octopus.energy
  • Triggering command: /home/REDACTED/work/batpred/batpred/coverage/venv/bin/python3 python3 ../apps/predbat/unit_test.py --quick (dns block)
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• gitlab.com
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• https://api.github.com/repos/springfall2008/batpred/contents/apps/predbat
  • Triggering command: /home/REDACTED/work/batpred/batpred/coverage/venv/bin/python3 python3 ../apps/predbat/unit_test.py --quick (http block)
  • Triggering command: /home/REDACTED/work/batpred/batpred/coverage/venv/bin/python3 python3 ../apps/predbat/unit_test.py --quick bin/rustc (http block)
  • Triggering command: /home/REDACTED/work/batpred/batpred/coverage/venv/bin/python3 python3 ../apps/predbat/unit_test.py --quick ps conf�� e-commit-hooks --global ndor/bin/bash HooksPath (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)