Feat: Optimize YOLOv8 Inference with Unified Single-Call Pipeline & Restore FeatureUpdate speed up

[yeonseok-zeticai]

• This PR introduces a significant performance optimization for the ZETIC.MLange Flutter plugin by implementing a Unified Native Pipeline. It consolidates the inference workflow (preprocess → run → postprocess) into a single native call, drastically reducing the communication overhead between Dart and the Native layer.

  • Addressed suggestions from @DenisovAV

• Performance Improvements

  • Unified Pipeline (runPipeline): Replaced the sequential MethodChannel calls with a single runPipeline method.
  • Reduced IO Overhead: Decreased Platform Channel calls from 4 to 1 per frame.
  • Zero-Copy Logic: Eliminated redundant data serialization and transfer of heavy tensor logic between Dart and Native during the inference loop.

• Key Changes

  1. Architecture: Shared Registry Pattern
  • Android/iOS: Updated ZeticMLangeModelFlutterPlugin to expose a thread-safe static registry. This allows the YOLOv8Wrapper plugin to directly access ZeticMLangeModel instances internally to orchestrate the pipeline natively.
  • Core: Added getInstanceOrNull to safely retrieve instances without triggering Flutter error results during internal calls.
  2. Feature: Unified Pipeline Implementation
  • Android (YOLOv8WrapperFlutterPlugin.kt): Implemented runPipeline to handle the full cycle (Preprocess → Model.Run → Postprocess) in a background thread.
  • iOS (YOLOv8WrapperFlutterPlugin.swift): Implemented equivalent logic using Swift concurrency and pointer manipulation for zero-copy handling.
  • Dart (yolov8.dart): Added the runPipeline API.
  3. Housekeeping & Fixes
  • Dependency Update: Migrated to com.zeticai.ext:ext:0.0.1 (Maven Central) and resolved libc++_shared.so packaging conflicts.
  • Documentation: Overhauled README.md with detailed installation steps, usage guides, and contribution standards.
  • Refactor: Updated example/lib/main.dart to utilize the new optimized pipeline.

• Verification

  • Build: Confirmed successful Android build (./gradlew assembleDebug) and clean flutter analyze results.
  • Functionality: Verified path to runPipeline integration in the example app.

[yeonseok-zeticai]

@DenisovAV, can you kindly review this PR? :)