feat: create data provenance graph

[akintewe]

Summary

• Backend: Added ProvenanceService with rich lineage data for price, health, TVL, and alert metrics. Created /api/v1/provenance (list) and /api/v1/provenance/lineage (full graph) endpoints and registered them in the route index.
• Frontend: Added ProvenanceNode, ProvenanceEdge, ProvenanceGraph, and ProvenanceListItem types. Added getProvenanceMetrics and getProvenanceLineage API client functions. Built the DataProvenanceGraph page with an SVG canvas showing source → transform → destination node columns, freshness dot indicators, latency labels on highlighted edges, a detail drawer for node inspection, and a node list table. Added the route /data-provenance and a "Provenance" nav link.

Features implemented

• Show source, transform, and destination nodes in a left-to-right column layout
• Freshness markers (fresh / stale / unknown) on every node via colored dot badges and timestamps
• Click a node to open a detail drawer exposing metadata, entity type/ID, connections, and last-updated time
• Latency labels render on highlighted edges when a node is selected
• Filter by node kind (source / transform / destination), asset, bridge, and metric type
• Responsive: the SVG scales fluidly; the node list table provides an accessible fallback

Test plan

• Navigate to /data-provenance — metric pills should load (price·USDC, health·USDC, tvl·Allbridge, alerts·EURC)
• Click a metric pill — SVG graph renders with correct node columns and edges
• Click a node — detail drawer opens with metadata, freshness badge, and connection list
• Click a connected node link in the drawer — selection jumps to that node
• Filter by kind "Source" — only source nodes remain visible
• Filter by asset "USDC" — metric list scopes to USDC entries
• Verify GET /api/v1/provenance and GET /api/v1/provenance/lineage?metric=price&asset=USDC return expected JSON
• Check desktop and mobile viewport widths

Closes #591

[Mosas2000]

There's conflict, fix this!

[akintewe]

There's conflict, fix this!

oh okk