feat: implement comprehensive CI/CD pipeline

[CowboyGH]

🚀 Summary

Implemented an automated CI pipeline in GitHub Actions for Flutter with code quality checks and reproducible builds for Android (via Docker) and iOS (via macOS runner).
The pipeline generates build artifacts (APK + unsigned IPA) on each run and publishes them to GitHub Actions artifacts for convenient download.

✨ What's Added / Changed

• ✅ Workflow: Full GitHub Actions configuration (.github/workflows/main.yml) with 3 jobs: analyze → build-android + build-ios.
• ✅ Android: Docker-based build that builds locally on the runner and extracts APKs from the built image (no registry push).
• ✅ iOS: Native build on macos-latest producing an unsigned IPA for testing.
• ✅ Quality: flutter pub get → build_runner → formatting verification (dart format --set-exit-if-changed) → flutter analyze → tests with coverage.

🛠 Build Process

• Analysis job: Runs formatting checks, analyzer, and tests; uploads coverage artifact (if present).
• Android job: Builds a Docker image with push: false and load: true so the image stays on the runner for docker create/docker cp APK extraction.
• iOS job: Builds iOS app without code signing and packages Runner.app into an unsigned .ipa for testing.

🧪 Verification

• Verify analyze job passes: formatting check, flutter analyze, tests (coverage artifact created if available).
• Verify Android artifacts are uploaded (APK files extracted from Docker image).
• Verify iOS artifact is uploaded (unsigned IPA).
• Confirm there is no Docker Hub push logic (pipeline is artifact-based, not registry-based).

[CowboyGH]

I'm tired...