Restructure into a monorepo: standalone LiquidToasts Swift package + Flutter plugin

[rehmatsg]

Restructures the repo so the SwiftUI renderer is a standalone Swift package installable straight from GitHub in any iOS app, with the Flutter plugin living beside it and consuming it by relative path. The wire protocol is unchanged (protocolVersion stays 1); the Dart API is unchanged except for two deliberate removals listed under breaking changes. Executed per the approved plan in docs/monorepo-plan.md.

Layout

├── Package.swift                  # root manifest — SwiftPM needs it at the repo root for git-URL installs
├── liquid-toasts-swift/
│   └── Sources/LiquidToasts/      # the Flutter-free core (manager, views, scheduler, models, native facade)
└── liquid_toasts/                 # the Flutter plugin (basename doubles as its SwiftPM identity —
    ├── lib/ test/ android/ example/       the old checkout-rename caveat is gone)
    └── ios/liquid_toasts/         # bridge only: channel plugin + wire decoding, depends on the core via path

What changed, phase by phase (one commit each)

1. Decouple the core from Flutter — wire decoding moved out of Models.swift into bridge-side WireModels.swift; the models gained plain memberwise initializers whose defaults mirror the wire defaults exactly. Flutter is imported only by the plugin and the wire decoders.
2. Public Swift API — typed dismiss reasons and events (raw values are the wire strings), multi-listener event fanout on ToastManager, a curated public surface, and the native LiquidToast facade: show/semantic variants/loading, live handles with patch updates and dismissal callbacks/await, an async promise that returns the value and rethrows, native id minting that coexists with Dart-minted ids on one stack, and a SemanticDefaults table kept in lockstep with lib/src/semantic_defaults.dart (cross-reference comments in both files). Event dictionaries reaching Dart were verified key-for-key identical.
3. The restructure — 163 git renames (history follows), the two manifests, podspec deleted (SwiftPM-only per the plan's decisions), URLs moved to SimplifyJobs, new umbrella/native READMEs, CLAUDE.md rewritten.
4. CI + releases — ci.yml (Dart analyze/test, iOS-simulator build of the root package, example app in SwiftPM mode, Android unit tests) and release.yml (fires on v* tags, reuses ci.yml, guards tag == pubspec version, publishes a GitHub Release from the CHANGELOG section). Version bumped to 0.8.0 with a CHANGELOG entry.

Follow-up commits on this branch: fixes from the first CI run and review round (scheme name, dismissAll re-entrancy snapshot, non-finite duration guard, plugin listener teardown on engine detach), and the two API removals below.

Breaking changes (all in the 0.8.0 CHANGELOG with migration pointers)

• CocoaPods dropped: iOS builds require flutter config --enable-swift-package-manager.
• Install is now a pubspec git dependency with path: liquid_toasts and ref: vX.Y.Z; pub.dev publishing is deferred (would need a vendoring step — documented in the plan).
• useDynamicIslandOrigin removed entirely — from Toast, every toast.* method, ToastHandle.update, the wire, the Android/iOS decoders, the native facade, and the geometry snapshot's supportsDynamicIslandOrigin key. No renderer on either platform ever consulted it. toast.queryGeometry() still reports the cutout itself.
• The deprecated legacy LiquidToasts facade, LoadingToast, and showLoading are deleted (were marked "Removed in 1.0"); every member has a one-line toast.* equivalent.

Needs verification on macOS (no Apple toolchain in this environment)

CI covers the builds (the swift, example, and android jobs compile everything, and the example job exercises the plugin-through-SwiftPM symlink path — the plan's one flagged structural risk, now passing). Before tagging v0.8.0, still worth a human pass:

1. A quick run of the example app plus the simulator probes (bg_probe_demo.dart, render_probe_demo.dart) to confirm runtime behavior is unchanged.
2. A scratch native app installing the branch by git URL to smoke-test the LiquidToast facade.

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