docs: improve development documentation

[olgahaha]

• Add CLAUDE.md with comprehensive development guide for AI assistants
• Add DEPLOYMENT.md with detailed deployment workflow documentation
• Add .github/copilot-instructions.md for GitHub Copilot guidance
• Update README.md with improved setup instructions and realistic development flow
• Modernize GitHub Actions workflows:
  • Replace tag-based triggers with workflow_dispatch for better UX
  • Add platform selection options for firebase-release (Android/iOS)
  • Remove deprecated Slack notifications from build and pre-release workflows
  • Streamline build-apks.yml with manual trigger support
• Update Android build configuration for improved compatibility

[Copilot]

Pull Request Overview

This PR modernizes the development documentation and build workflows to improve developer experience and deployment processes. The changes focus on providing comprehensive guidance for working with the Angular/Ionic mobile app that has environment-specific limitations.

• Updated GitHub Actions workflows to use manual triggers instead of tag-based deployment
• Added comprehensive documentation files for AI-assisted development and deployment workflows
• Updated Android build configuration to target newer API levels and build tools
• Modernized README with realistic development flow acknowledging local environment constraints

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Updated with AI-assisted setup guide and realistic development workflow
DEPLOYMENT.md	Added comprehensive deployment guide with step-by-step instructions
CLAUDE.md	Added AI assistant guidance for repository structure and development
.github/copilot-instructions.md	Added GitHub Copilot-specific development instructions
.github/workflows/*.yml	Modernized workflows with manual triggers and removed deprecated notifications
android/variables.gradle	Updated compile and target SDK versions to 36
android/build.gradle	Updated Android Gradle Plugin to version 8.9.1

Comments suppressed due to low confidence (3)

android/variables.gradle:3

• Android SDK API level 36 does not exist. The latest stable Android API level as of January 2025 is API 35 (Android 15). Consider using API 35 or verify if this is intentional for future compatibility.

    compileSdkVersion = 36

android/variables.gradle:4

• Android SDK API level 36 does not exist. The target SDK version should match an existing API level. Using a non-existent API level may cause build failures or unexpected behavior.

    targetSdkVersion = 36

android/build.gradle:10

• Android Gradle Plugin version 8.9.1 does not exist. The latest stable version as of January 2025 is 8.7.x. Consider using a verified version like 8.7.2 to avoid build failures.

        classpath 'com.android.tools.build:gradle:8.9.1'