[wave 2] studio: config-drift dashboard (live vs declared, one-click re-apply)

[robercano]

What

Surface @redeploy/verify's verifyConfig drift results visually in the studio inspector: per-step match/drift/error badges on the graph (green/amber/red), a drift detail panel (expected vs actual value), and one-click re-apply of drifted steps.

Scope sketch

• deploy-server: GET /api/config-drift (runs verifyConfig against the live chain via its ChainReader, network-aware).
• studio: drift overlay on the inspector graph + detail panel; "re-apply" wiring to the apply-config action (depends on the wave-1 applyConfig endpoint issue).

Depends on

[wave 1] applyConfig endpoint issue (for the re-apply action).