security: phishing domain denylist should be CDN-sourced with signed manifest

[nanaf6203-bit]

Summary

PhishingProtection keeps a static list of known phishing domains inside the bundle; freshness is hard to verify and bundling supports larger attack lists.

Affected area

src/utils/security/phishingProtection.ts

Steps to reproduce / impact

Outdated list = high false negatives. Large list = bundle bloat.

Expected behaviour

Source the list from a trusted CDN at runtime with a signed manifest, fallback to a small in-bundle denylist. Document the update cadence.

Acceptance criteria

• CDN manifest schema documented.
• Fallback list size shrinks.
• Update procedure for the list explained in README.

[sandrawillow001-afk]

@sandrawillow001-afk has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

will love to work on this issue sir

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[lawrettaumebe710-maker]

@lawrettaumebe710-maker has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello maintainer I would like to work on this issue

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