refactor: cache platform SDK connections per network

[PastaPastaPasta]

Summary

• connectPlatformSdk now returns a cached singleton per network instead of creating a fresh EvoSDK instance on every call, eliminating repeated connection overhead for sequential operations.
• Added disconnectPlatformSdk(network) export so callers can force a fresh connection on error.
• withConnectedPlatformSdk invalidates the cache on connection-level errors (transport/network failures) but keeps it alive for application-level errors (identity not found, etc.).

Test plan

• npm run build passes (verified locally)
• Verify sequential Platform operations (e.g. fetch identity then check balance) reuse the same connection (single "Connecting to..." log)
• Verify connection-level failure (e.g. network offline) clears the cache and retries with a fresh instance on next call
• Verify application-level errors (e.g. identity not found) do not disrupt the cached connection

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d3a0b377-7b7a-44f8-b69b-ad39ec818d35

📥 Commits

Reviewing files that changed from the base of the PR and between 26ddc07 and 3ed4312.

📒 Files selected for processing (1)

• src/platform/client.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/cache-platform-sdk-connections

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