Add HACS support: validate workflow, hacs.json, fix manifest

docs: update Add-ons → Apps (HA 2026.2+ terminology)

chore: add .gitignore to prevent secrets from being committed

Add FUNDING.yml for GitHub Sponsors and Ko-fi

Add brand icons and bump version to

v1.1.1 – Fix free model errors and improve error messages

v1.1.0 – Built-in terminal, model selector dashboard, extras

feat: OpenRouter Bridge v1.0 – Anthropic-compatible proxy for HA