* Add warning for TwelveData plan-restricted tickers
Fixes#800
- Add Security::PlanRestrictionTracker concern using Rails cache
- Detect plan upgrade errors during Security::Price::Importer sync
- Display amber warning on /settings/hosting with affected tickers
- Include unit tests for the new functionality
* Scope plan restriction cache by provider
Addresses review feedback:
- Cache key now includes provider name to support multiple data providers
- Methods now require provider parameter for proper scoping
- Added tests for provider-scoped restrictions
- Added documentation explaining instance-level API key architecture
* Fix RuboCop array bracket spacing
* Fix empty array bracket spacing
* Move plan upgrade detection to Provider::TwelveData
* Fix provider scoping tests to use direct cache writes
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Co-authored-by: mkdev11 <jaysmth689+github@users.noreply.github.com>
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