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feat(env): implement environment configuration and setup script (#43)

- Expanded .env.example with all required variables including:
  - AI provider keys (Anthropic, OpenAI)
  - GitHub OAuth integration
  - EAS/Expo build configuration
  - App Store submission variables (iOS/Android)
  - Optional analytics and monitoring

- Created app.config.ts dynamic Expo config:
  - Environment-specific configuration (dev/staging/prod)
  - Automatic environment detection
  - Type-safe environment variable access
  - Different bundle identifiers per environment

- Created src/lib/env.ts for runtime environment validation:
  - Type-safe EnvironmentConfig interface
  - validateEnvironment() for startup validation
  - isFeatureEnabled() for feature flags
  - apiUrls constants for API endpoints

- Created scripts/setup.sh for first-time contributors:
  - Checks for Node.js 18+ and pnpm
  - Creates .env.local from .env.example
  - Installs dependencies
  - Runs type check

- Created docs/development/ENVIRONMENT.md:
  - Comprehensive environment setup guide
  - EAS secrets management instructions
  - Security best practices
  - Troubleshooting section

- Added 10 unit tests for env module
- Updated package.json with setup and dev scripts
- Updated SETUP.md with quick start instructions

Closes #7

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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