Add 11 packages by devShakib

[devShakib015]

Adding 11 packages to Flutter Gems. All are published on pub.dev, MIT licensed, and currently score 160/160 pub points.

Package	What it does	Suggested category
apple_foundation_models	Apple's on-device foundation model from Flutter	ChatGPT, LLM & Generative AI
apple_intelligence	Writing Tools and Genmoji	ChatGPT, LLM & Generative AI
roomplan	Scan a room with RoomPlan, get it back as data	AR & VR
ar_quick_look	Show a USDZ/Reality file in Apple's AR Quick Look	AR & VR
vitals	HealthKit and Health Connect, typed and testable	Health & Fitness
anchored_list	Scroll to an index in a lazily built list	List
masonry_kit	Masonry grids as slivers in one CustomScrollView	Grid
fit_text	Text that sizes to fit, working inside Table and IntrinsicHeight	Autoformat, Masking & Validation
loading_kit	Loading overlays with a reveal delay and minimum hold	Indicators: Loading, Refresh, Progress
file_system_access	Real files on Flutter Web via the File System Access API	File, Folder & Path Utilities
cross_tab	Coordinate browser tabs: messaging, presence, leader election	Flutter Web

Categories were picked to match where comparable packages already sit — google_generative_ai for the LLM ones, ar_flutter_plugin for AR, health for vitals, scrollable_positioned_list for anchored_list, flutter_staggered_grid_view for masonry_kit, auto_size_text for fit_text, loading_animation_widget for loading_kit, file_system_access_api for file_system_access, and universal_html for cross_tab. Happy to move any of them if you'd categorise differently.

Thanks for maintaining Flutter Gems.