chore: promote reviewed application stack to main

[Gongamax]

📖 Summary

Promotes the reviewed stacked PRs into main after the individual review sequence was completed.

🤔 What has been done?

• Brings the reproducible local Ethereum setup, modular blockchain service, wallet-first app flows, certificate replacement confirmation, Reown AppKit migration, and UI/documentation polish into main.
• Preserves the reviewed stack exactly as merged through PRs Feat: make local Ethereum setup reproducible #9-Fix: polish application interface and documentation #14.
• Keeps local configuration out of version control while preserving CI compatibility through the config fallback added in PR Chore: clean generated and local project files #8.

Evidence

• npm run test:blockchain
• npx expo export --platform ios
• Manual QA completed

Review notes

Depends on: PRs #8-#14

Out of scope:

• New feature work beyond the reviewed stack
• Benchmark or paper result changes
• Additional dependency vulnerability remediation

Checklist

• The PR has one clear responsibility
• No secrets, private keys, or local endpoints are committed
• Documentation reflects user-facing or setup changes
• Dead code and obsolete dependencies were not introduced