Feat: Changelly integration

[peachbits]

Replaces #5988, reordered so the obfuscation utility lands first:

1. Add asObfuscatedString cleaner — a codec that decodes strings stored as arrays of XOR-masked char codes, plus scripts/obfuscateString.ts to generate the arrays.
2. Feat: Changelly integration — enables the changelly swap plugin with CHANGELLY_INIT: an apiKey stored XOR-obfuscated in env.json plus a plaintext partnerId (edge-app), both required with no defaults, passed to the plugin via initOptions (see Add Changelly swap plugin edge-exchange-plugins#471).

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Note

Medium Risk
New third-party swap integration and env credential handling; impact is limited to swap quoting/execution when config is present, not core auth or funds custody.

Overview
Adds Changelly as a centralized swap provider, gated by new CHANGELLY_INIT in env config (apiKey via XOR-masked char arrays, plaintext partnerId; both optional with no defaults so incomplete config disables the plugin). The provider is registered in swapPlugins and gets the usual UI wiring (CDN icon, KYC/terms links in SwapVerifyTermsModal).

Introduces asObfuscatedString (cleaner + scripts/obfuscateString.ts) so sensitive env fields can be stored as obfuscated arrays instead of plain strings.

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