v1.0.0 of ann_flutter_flavor

Multi-flavor Flutter toolkit. Reads annspec.yaml, generates typed flavor classes, and wires Android, iOS, Firebase, AdMob and RevenueCat. Changelog excerpt: ### Added - `tooling:`section in `annspec.yaml`— declare `gradle_plugin`, `cocoapods_plugin`, and `fastlane_plugin`version constraints. `sync`reads these to patch `android/settings.gradle.kts`and `Gemfile`with the specified versions. -…