feat: HTTP panel on :8000 with first admin setup

Dockerfile.panel

@@ -0,0 +1,19 @@
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 go build -o /panel ./cmd/panel
+
+FROM alpine:3.20
+
+RUN apk add --no-cache ca-certificates
+
+COPY --from=builder /panel /panel
+
+EXPOSE 8000
+
+ENTRYPOINT ["/panel"]