Kicks off the single-pane-of-glass command-center rewrite. Legacy /api/* handlers untouched — v2 is additive so cutover is safe. Doc: docs/dashboard-v2.md — design goals, endpoint spec, cutover plan. Backend: new serve_v2 module wired into serve.rs. Endpoints: GET /api/v2/node/local/status GET /api/v2/node/:name/status (fan-out: not-yet-impl) GET /api/v2/storage/blobs?limit&offset GET /api/v2/storage/tags?prefix GET /api/v2/storage/refs?limit&offset GET /api/v2/storage/snapshots GET /api/v2/storage/ref-tracking?repo V2State opens BlobStore / TagStore / RefStore / SnapshotStore / RefTracking under the daemon's blob_store_root + the conventional subdirs (tags-db, refs-db). All handlers are single-node reads; cross-node fan-out lands in PR 3. +6 tests: status w/ seeded blob+snapshot, cross-node returns 501, blobs pagination, tags prefix filter, snapshots list, ref-tracking repo filter. 395 tests pass. serve.rs merges v2 routes onto the axum router with shared CORS. Single-shot deploy on tank + architect will expose /api/v2/* alongside the existing /api/*. PR 2 = frontend rewrite consuming these endpoints. PR 3 = fleet fan-out (cross-node aggregation via QUIC RPC). PR 4 = action endpoints (POST scrub/gc/snapshot/pin). PR 5 = cutover (deprecate legacy /api/*).
