feat(wasm): add WebAssembly API surface for browser execution

[manoahLinks]

Add a self-contained starforge-wasm crate that compiles StarForge's core wallet functionality to WebAssembly (wasm32-unknown-unknown), enabling browser-based execution in web IDEs and dev environments. It exposes a wasm-bindgen API for browser wallet management (random keypair generation, BIP39 mnemonic generation, SEP-0005 derivation, address validation) and browser storage for configuration via localStorage. The crate depends only on pure-Rust crypto primitives so the native CLI build is unaffected.

Closes #341
Closes #342
Closes #345
Closes #324

Description

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Closes #(issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Changes Made

• Change 1
• Change 2
• Change 3

Testing

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• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed

Test Coverage

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Code Quality Checklist

• My code follows the style guidelines of this project (cargo fmt)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings (cargo clippy -- -D warnings)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• The CI checks pass (format, clippy, tests)

Breaking Changes

• This PR introduces breaking changes

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Documentation

• README.md updated
• DEVELOPER_GUIDE.md updated (if applicable)
• API_REFERENCE.md updated (if applicable)
• No documentation changes needed

Screenshots (if applicable)

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Additional Context

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Note: Make sure all tests pass locally before submitting:

cargo test
cargo fmt --all
cargo clippy -- -D warnings

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