refactor: centralize platform sdk connections

[PastaPastaPasta]

Summary

• centralize trusted EvoSDK creation, shared settings, connect-with-retry, and Platform read helpers in src/platform/client.ts
• route identity, DPNS, contract, and UI-side balance reads through the new Platform service without changing feature-level APIs

Testing

• npm run build

This pull request was created by Codex.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d8323544-cb96-4dd0-af9c-74247a3c3d58

📥 Commits

Reviewing files that changed from the base of the PR and between 56e51b4 and a645988.

📒 Files selected for processing (5)

• src/main.ts
• src/platform/client.ts
• src/platform/contract.ts
• src/platform/dpns.ts
• src/platform/identity.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/centralize-platform-connections

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