feat: add analytics heartbeat to iOS mobile app

[datlechin]

Summary

• Create shared TableProAnalytics module in TableProCore with protocol-based dependency injection
• Refactor macOS AnalyticsService from 164 lines to thin wrapper (32 lines) using shared service
• Add analytics heartbeat to iOS mobile app with 20h cooldown for foreground/background cycles
• Add SettingsView to mobile app with privacy toggle for analytics opt-out
• macOS now sends platform: "macos", iOS sends platform: "ios" (backend PR Structure View Refactor & Keyboard Handling Migration #24 in license repo)

Architecture

• AnalyticsEnvironmentProvider protocol — platform-specific data injection (IOKit/UIDevice, DatabaseManager/AppState)
• AnalyticsHeartbeatService — shared: encoding, HMAC signing, HTTP transport, heartbeat loop, cooldown
• MacAnalyticsProvider — macOS implementation
• IOSAnalyticsProvider — iOS implementation with stable device ID (identifierForVendor + UserDefaults persistence)

Test plan

• macOS builds successfully
• iOS builds successfully (CODE_SIGNING_ALLOWED=NO)
• Run macOS app → verify heartbeat in console log after 10s
• Run iOS app in simulator → verify heartbeat fires
• iOS Settings → toggle analytics off → verify heartbeat skips
• iOS background/foreground → verify no duplicate heartbeats within 20h