feat: Spotlight search and Siri Shortcuts for iOS

[datlechin]

Summary

• Connections appear in iOS Spotlight search via CoreSpotlight indexing
• Tap Spotlight result to open app and connect directly
• Siri Shortcuts: "Open [connection] in TablePro"
• AppIntents framework: ConnectionEntity, OpenConnectionIntent, AppShortcutsProvider
• Index updates on connection add/remove/edit/sync

Test plan

• Add connections, search in Spotlight — connections appear
• Tap Spotlight result — app opens and navigates to connection
• Open Shortcuts app — "Open Connection" action available
• Create shortcut with connection parameter — runs correctly
• Delete connection — removed from Spotlight
• Siri: "Open [name] in TablePro" — opens connection