#42 Issue 42: [API] Token Distribution Endpoint (Pie Chart Data)


Description:
Provide an endpoint that categorizes vaults by "Tag" (e.g., Seed, Private, Advisors, Team) to power a tokenomics pie chart on the frontend.
Acceptance Criteria:

[ ] GET /api/token/:address/distribution.

[ ] Return [{ label: 'Team', amount: 5000000 }, ...].
Labels: api, analytics