feat(backend): add name/description length validation to registerServiceOnChain

[leocagli]

Fixes #25

Problem

register_service in the Soroban contract accepts arbitrary-length String for both name and description with no bounds. An attacker can register a service with a megabyte-long description at negligible cost, growing the on-chain storage permanently.

Solution

Added pre-flight validation in backend/src/lib/contract.js inside registerServiceOnChain() before any RPC call:

const NAME_MIN = 3, NAME_MAX = 64;
const DESC_MIN = 10, DESC_MAX = 256;

// throws INVALID_NAME / INVALID_DESCRIPTION before touching the chain

Bounds chosen to match the frontend RegisterForm validation (name 3–50, description 10–200) with slightly wider server-side limits (3–64 / 10–256) so the backend is never stricter than the frontend without good reason.

No RPC calls are made on invalid input — the validation throws immediately, saving transaction fee budget for the caller.

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Reviewing files that changed from the base of the PR and between 6fb6da9 and a1dd500.

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• backend/src/lib/contract.js

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