* Implement collapsible sections for options flow
Replace single-form options flow with collapsible sections:
- Basic options always visible (9 fields)
- Advanced options in collapsed section (collapsed by default)
- Single form, no multi-step navigation needed
Changes:
- const.py: Add BASIC_OPTIONS set defining which options are basic
- config_flow.py: Use section() from data_entry_flow to wrap advanced options
- strings.json: Restructure with sections.advanced for section translations
- tests: Update to handle nested section input format
* Update README.md, strings.json, and services.yaml
* Fix: Use vol.Required for section to render properly
* Fix section structure: separate basic and advanced fields in strings.json
* Remove accidentally added files
* Add local directories to gitignore
* Update README.md, strings.json, and services.yaml
* Preserve options behavior with collapsible sections
* Test serialized advanced options section
* fix: preserve config metadata when retrying options
* fix: keep options form defaults serializable
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