Add RWA asset creation wizard (#29)

[Justine-Ifedozie]

Description

Adds a guided asset creation wizard to the Issuer Console (/issuer), letting
issuers submit a new RWA asset for compliance review. This is the missing
"create" counterpart to the existing minting workflow (#6): a request created
here starts in pending status in the existing issuance-request lifecycle
(draft → pending → approved → minted → rejected) and only becomes mintable
after a separate compliance approval step (out of scope here, already existed
in the table's status model).

Related Issue: Closes #29

Type of Change:

• New feature (non-breaking change that adds functionality)

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Evidence Checklist

1. Issue Reference

• This PR references a tracked issue
• Issue Link: Add RWA asset creation wizard #29

2. Implementation Summary

• See description above.
• Files Changed:
  • src/lib/assetCreationRequest.ts (new) — pure validation module, mirrors mintRequest.ts
  • src/lib/assetCreationRequest.test.ts (new) — 11 unit tests
  • src/features/asset-creation/components/AssetCreationWizard.tsx (new) — 3-step wizard (form → review → submit)
  • src/features/asset-creation/components/AssetCreationWizard.test.tsx (new) — 7 component tests
  • src/pages/issuer.tsx (modified) — wires the wizard into a modal, adds "New asset request" button
  • docs/rwa-asset-creation-wizard.md (new) — design doc, edge cases, security/compliance assumptions
  • docs/README.md (modified) — indexes the new doc
  • README.md (modified) — links the new doc

3. Testing

• Tests have been added or updated to cover the changes
• All existing tests pass locally (except a pre-existing, unrelated failure — see note below)

Test Commands Run:

npm run lint
npx tsc --noEmit
npm test

Test Output (summary):

[El-swaggerito]

\nThis PR is currently blocked by merge conflicts.\n\nPlease update the branch with the latest main branch and resolve the conflicts before it can be merged.