research: add UI reference mockup with installation differences

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

research/ui/README.md

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+# UI references
+
+| File | What |
+|---|---|
+| `reference-dashboard.png` | Look and layout we like (generated mockup, 2026-10-23). A style reference, not a spec of our installation. |
+
+Differences from our installation, to respect when designing from it:
+
+- Heat pump: ground source with **boreholes**, indoor unit; no outdoor air unit with a fan.
+- Solar on the roof is **thermal** (heats the CWU tank), not photovoltaic: no solar kW.
+- The controller gives no power or energy figures, and no CO return, solar collector or well
+  temperature, and no mixing valve. Electricity can only come from a separate meter in InfluxDB.
+- Weekly program hours need selector writes to read (see `docs/roadmap.md`), so they are not
+  on the overview for now.
+
+Available from the controller for such a screen: outdoor, indoor, CO, CWU, ground in/out and
+pump outlet temperatures; targets 4201–4203; pump state 4227; compressor stage and every pump
+4112–4118; operating mode 4123 (summer/winter/auto); heating curve 4134; alarm 4221.