fix: align local Studio chain defaults

[MuncleUscles]

Summary

• change the tracked local Studio bootstrap chain ID from the stale hosted-Studio value to canonical localnet 61127
• document the required update for .env files copied before v0.123
• add a backend static regression keeping .env.example, backend fallback, and Hardhat fallback aligned
• add a frontend default-network regression for the SDK-backed localnet value

Root cause

Studio and genlayer-js moved localnet to 61127, but the tracked environment template retained 61999. Copying that template caused local deployments to diverge from the published SDK preset and could surface InvalidChainId on signed submissions.

The cross-repository E2E previously masked this by forcing a runtime ID and rewriting SDK presets.

Validation

• frontend network-store unit tests: 3 passed
• frontend TypeScript build check
• backend bootstrap-consistency test: 1 passed
• repository pre-commit hooks

Related

• fix: align localnet chain id with Studio genlayer-py#115 (merged): corrects the Python localnet preset and adds signer-level regression coverage.

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