ci: add split iOS validation workflows

[zzstar101]

Summary

• add separated iOS quality, SwiftPM, MDBX compatibility, Xcode build, and Xcode test workflows
• validate latest Monica-Pass/Mdbx by checking it out beside the iOS repository before generating the XCFramework
• cover Debug/Release Xcode builds for the app and extensions, XCTest, plist/entitlement linting, manifest checks, and pure Swift package tests

Local verification

• ruby YAML parse for all workflow files
• git diff --check
• plist/entitlement lint and Swift package manifest dump checks
• swift test: MonicaCore, MonicaSecurity, MonicaSync, MonicaUI
• swift build -c release: MonicaCore, MonicaSecurity, MonicaSync, MonicaUI

Note: full MDBX XCFramework generation is wired into Actions and was not run locally in this isolated worktree because the sibling mdbx checkout and UniFFI bindgen are provided by the workflow.