feat: implement fiber wasm demo

[ashuralyk]

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[gemini-code-assist]

Code Review

This pull request adds a Fiber node demo for managing in-browser nodes, peers, and payments. Feedback focuses on narrowing security header scope to maintain wallet compatibility, fixing signature byte conversion for key derivation, and replacing floating-point math with fixed-point utilities to ensure precision for CKB amounts.

[gemini-code-assist]

The source pattern /(.*) applies the COOP and COEP headers to all routes. However, the comments on lines 9-12 state that these headers should only be applied to /connected/Fiber because they break cross-origin wallet popups (like JoyID) used on other pages. Applying these headers globally will break wallet functionality for the rest of the application, including the /fiber-sign-proxy mentioned in the comments.

Suggested change

	source: "/(.*)",
	source: "/connected/Fiber",