Add Kotlin plugin system (SDK, host, hooks, settings UI)
Implement exteraGram-style plugin architecture for Android and desktop:
- plugins/sdk: BasePlugin API, hook types, settings DSL
- plugins/host: PluginEngine, typed send hooks, FeatureGate, HookRegistry
- JVM ByteBuddy and Android Pine hook backends
- DevServer on port 42690 (JVM)
- Plugins settings screens and PluginUiHost bulletin overlay
- hello_world sample plugin packaged as .fcplugin
- ProGuard keepnames for ru.fromchat.** with shrinking enabled
Co-authored-by: denis0001-dev <denis0001.dev@ya.ru>
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