docs: complete V1 full flow and API audit

[wagmiiii]

Closes #192

Summary

This PR adds the requested V1_AUDIT.md file, documenting the current state of the v1 branch routing, authentication flows, and API integrations.

Key Findings & Discrepancies Flagged

• CRITICAL: The /signup and login API endpoints are currently returning 404 Not Found, which completely blocks user entry into the dashboard UI.
• Missing Admin: The entire /admin directory and its associated routes are missing (returning 404 Not Found).
• Route Mismatch: The specification called for a /login route, but the front-end is actively using /sign-in. The redirect guards correctly point to /sign-in.
• Positive (Mocks Cleared): Code-level inspection confirms that the main dashboard components (account-overview, convert-form, transaction-table) have successfully had their hard-coded mock data stripped and are properly wired up to API fetcher functions.
• Broken Navigation: The "Sign up" link on the /sign-in page contains a typo, pointing to /sign-up instead of /signup, resulting in a 404 error.

Acceptance Criteria Met

• Every route listed in scope has been tested and its result recorded
• The full auth flow has been walked and failures clearly documented
• Every file in lib/api/ has been mapped to a live endpoint status
• Every section previously using mock/stub data has been identified and verified fixed
• All console errors observed during the walk-through are logged
• V1_AUDIT.md is committed to the root of the v1 branch

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Security Note: No real credentials, live wallets, or sensitive data were used or exposed during this manual browser audit.

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[portableDD]

@wagmiiii this pr is to target v1 and not main please fix

[wagmiiii]

@portableDD
Done! I've updated the base branch to v1. Thank you.

[portableDD]

lgtm