Chore: clean generated and local project files

[Gongamax]

📖 Summary

Cleans repository hygiene before functional changes. This removes generated/local artifacts from version control, keeps local configuration out of commits, and adds a PR template for the remaining stack.

🤔 What has been done?

• Removed tracked generated/local files such as native build outputs, local config, stale lock files, and old TODO artifacts.
• Added code/config.example.json and updated ignore rules for local development files.
• Removed the deprecated baseUrl option from the JavaScript project config.
• Added the repository pull request template.

Evidence

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

Review notes

Depends on: None

Out of scope:

• Runtime feature behavior
• Wallet integration changes
• Blockchain/domain logic changes

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

[aplf]

It seems fine and ready to merge.