suibase proxy server (phase II)

[mario4tier]

This is continuation of phase I (#52)

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At this point, all major proxy server internal components are "verified working" but each needs more refinement.

It has been verified that the proxy server does its job (can have multiple Sui apps use the proxy while it alternates between two remote servers).

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What need to be completed in this second phase:

• integration with start/stop/status suibase scripts
• support proper fallback logic (right now monitors health, but just pick the first server that works).
• retry logic (but logic for per request JSON parsing and decision is in-place).
• better integration with suibase.yaml (hot-reload).
• JSON-RPC API (for stats + health status of the remote servers).

[mario4tier]

This feature is now completed for its first release (Sui Foundation Milestone #1 completed)