refactor: change ecc lib to a more performant one

[Overtorment]

Note

Medium Risk
Crypto backend swap changes low-level key/EC math behavior; subtle compatibility differences could break address derivation or UTXO detection despite test coverage.

Overview
Switches the library’s secp256k1 backend from the custom @noble/secp256k1 wrapper to tiny-secp256k1, updating all ECDH/shared-secret and key math call sites and dropping src/noble_ecc.ts (plus its create-hash/noble deps).

Adds a small in-module scalar multiply helper (_privateMultiply) and a new isOurUtxoUsingTweakbscanBspendAndOutputScriptUint8array fast-path to avoid hex conversions when checking outputs. Bumps package version to 3.0.0, updates docs wording/usage headings, and refreshes tests (including a new tweak test vector and perf-oriented checks).

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	tiny-secp256k1@​2.2.4

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