feat: scaffold MyPassCore Swift Package
- Add MyPassCore local Swift Package with directory structure for Models, KDBX, TOTP, Keychain, AutoFill, and Session modules - Add KeePassKit as git submodule (Vendor/KeePassKit) with SPM wrapper Package.swift since upstream has no native SPM support - Delete SwiftData boilerplate Item.swift from main app target Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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