fix(ci): update dashboard detection to apps/hub/dashboard/

infra/docker/dashboard.Dockerfile

@@ -1,7 +1,7 @@
 # ── Build stage ──
 FROM golang:1.24-alpine AS builder
 WORKDIR /build
-COPY infra/dashboard/ ./
+COPY apps/hub/dashboard/ ./
 RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o dashboard .
 
 # ── Runtime (scratch — ~7MB total) ──