Add Aalto Q20, refactor QC layouts, and retire Helmi

[JooNiv]

Add Aalto Q20, refactor QC layouts, and retire Helmi

Aalto Q20

• Add Q20 to the status page and resource listings.
• Add Q20 device metric definitions in deviceMetrics.js
• Add the Q20 topology map and the assets/images/aalto-qc/aalto-q20.webp image.
• Update the status-page alert to "Aalto Q20 is now available for use" (info).

Helmi (VTT Q5) end-of-life

• Remove Helmi from the active quantum-computer list and the Helmi.jsx layout.
• Move Helmi into the resources page as a decommissioned ("End of life") device.
• Replace Helmi-specific acknowledgement links with a single academic-call link.

QC layout refactor

• Replace the per-device layout components (Base.jsx, Helmi.jsx, Q50.jsx)
  with a single reusable QcLayout.jsx.
• Introduce layouts.js, where each device is described purely as data
  ({ spacing, nodes, edges }) keyed by device ID. Adding a new QC now only
  requires a new entry here.
• Node positions use a grid(xOrigin, yOrigin, spacing) helper so coordinates
  read as grid offsets instead of repeated origin/spacing arithmetic.
• Cap node rendering size (MAX_NODE_PX) so smaller layouts like Q20 don't scale
  up disproportionately.
• add move/pinch/pan support to layout view with react-zoom-pan-pinch package

Metrics

• getMetricStatistics() now accepts an optional qubits argument to split
  single-qubit vs. two-qubit (coupler) metrics that share a calibration key.
• Update Q50 Clifford gate fidelity key to clifford_rb_xy_sx_fidelity.
• Update device metric keys and add QPU sorting in the status sidebar.

corresponfing backend pr: https://github.com/FiQCI/fiqci-backend/pull/10