Implement strict mode feature for content-aware service filtering
- Add strictMode option to filter services based on content support level
- Add contentSupport field to ServiceConfig with four levels:
- 'only-profiles': Profile-only services (6 services)
- 'only-posts': Posts-only services (skythread)
- 'profiles-and-posts': Profiles and posts only (toolify.blue)
- 'full': Complete content support (4 services)
- Update buildDestinations() with smart filtering logic:
- Posts: Show only-posts, profiles-and-posts, and full services
- Feeds/Lists: Show only full support services
- Profiles: Show all applicable services
- Add strict mode checkbox to options page
- Add comprehensive test suite (6 new tests, 72 total passing)
- Maintain backward compatibility (defaults to false)
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Co-Authored-By: Claude <noreply@anthropic.com>