docs: build-for-one-install note, roadmap and refreshed screenshots (#17)

* docs: add build-for-one-install note, roadmap and phase table

State upfront that Helios is built for one specific installation (hardware
hardcoded) and is not plug-and-play; generalization is on the roadmap, not
done. Add a small phase table to both READMEs and a ROADMAP.md with the
four phases (1-2 done, 3 configurable hardware under HAOS, 4
multi-installation via API).

* chore(assets): refresh screenshots to current UI (EN/ES)

Regenerate hero/history/battery in English and Spanish, light and dark, at
2x (2880x1800) from the local dev server against HAOS and the dev DB. The
UI moved on since the previous set (admin bar, accent picker, mobile).

---------

Co-authored-by: gnacho <hnacho@proton.me>

Author: gnacho

README.es.md

@@ -24,6 +24,14 @@ histórico, datos en vivo desde Home Assistant y el ahorro en euros
 calculado contra la tarifa eléctrica real. Un único servicio Node +
 SQLite corriendo en un LXC en casa. Sin nube.
 
+> **Hecho a medida para una instalación.** Helios corre mi propia
+> configuración — dos inversores concretos y una batería — y esos datos
+> están hardcodeados. No es un monitor solar genérico "plug-and-play", y de
+> momento no tengo interés inmediato en hacerlo (la configurabilidad del
+> hardware está en la [hoja de ruta](#hoja-de-ruta), pero sin hacer). Es
+> poco probable que te sirva tal cual. Forkea el repo y adáptalo a tu
+> instalación.
+
 ## ¿Por qué existe?
 
 Las apps de los fabricantes (Solis Cloud y similares):
@@ -135,6 +143,17 @@ Inversores (Solis/Fox) ──integraciones──▶ HAOS ──WebSocket──
 - Actualizar = desplegar el build nuevo y reiniciar el servicio; la BD y
   el `.env` (`/opt/helios/`) sobreviven siempre.
 
+## Hoja de ruta
+
+| Fase | Qué | Estado |
+|---|---|---|
+| 1 | Panel live de solo lectura (producción vs consumo) | Hecho |
+| 2 | Backend real, multiusuario, histórico, batería, alertas, PWA, endurecimiento | Hecho (~0.6.x) |
+| 3 | Inversores y placas configurables (siempre bajo HAOS) | Planificado |
+| 4 | Multi-instalación: varios HAOS o varios Helios vía API | En exploración |
+
+Ver [ROADMAP.md](ROADMAP.md) para más detalle.
+
 ## Gracias enormes
 
 Helios no existiría sin [Home Assistant](https://www.home-assistant.io/).

README.md

@@ -24,6 +24,13 @@ from Home Assistant, and savings in euros computed against the real
 electricity tariff. One Node + SQLite service running in an LXC at home.
 No cloud.
 
+> **Built for one install.** Helios runs my own setup — two specific
+> inverters and one battery — and those details are hardcoded. It is not a
+> generic, plug-and-play solar monitor, and I have no immediate plans to
+> make it one (configurable hardware is on the [roadmap](#roadmap), but not
+> done). It will probably not be useful to you as-is. Fork it and adapt it
+> to your own installation.
+
 ## Why does this exist?
 
 The manufacturers' apps (Solis Cloud and friends):
@@ -135,6 +142,17 @@ Inverters (Solis/Fox) ──integrations──▶ HAOS ──WebSocket──▶
 - Update = deploy the new build and restart the service; the DB and the
   `.env` (`/opt/helios/`) always survive.
 
+## Roadmap
+
+| Phase | Focus | Status |
+|---|---|---|
+| 1 | Live read-only panel (production vs consumption) | Done |
+| 2 | Real backend, multi-user, history, battery, alerts, PWA, hardening | Done (~0.6.x) |
+| 3 | Configurable inverters and panels (still under HAOS) | Planned |
+| 4 | Multi-installation: several HAOS or several Helios via API | Exploring |
+
+See [ROADMAP.md](ROADMAP.md) for detail.
+
 ## Big thanks
 
 Helios wouldn't exist without [Home Assistant](https://www.home-assistant.io/).

ROADMAP.md

@@ -0,0 +1,27 @@
+# Roadmap
+
+This is a personal project. The roadmap reflects the direction I have in mind,
+not promises or dates. Phases 1 and 2 are done; 3 and 4 are ideas I want to
+explore.
+
+| Phase | Focus | Status |
+|---|---|---|
+| 1 | Live read-only panel (production vs consumption) | Done |
+| 2 | Real backend, multi-user, history, battery, alerts, PWA, hardening | Done (~0.6.x) |
+| 3 | Configurable inverters and panels (still under HAOS) | Planned |
+| 4 | Multi-installation: several HAOS or several Helios via API | Exploring |
+
+## Phase 3 — Configurable hardware, still under HAOS
+
+Today the installation (inverters, panels, battery) and the HAOS sensor mapping
+are hardcoded for one setup. Phase 3 makes that configurable so another
+installation with a different number or model of inverters can run Helios
+without touching code. HAOS stays the source of truth for live data: Helios
+consumes, it does not talk to the inverters directly.
+
+## Phase 4 — Multi-installation
+
+One Helios instance watching a single installation is fine for one home. Phase 4
+explores monitoring several installations from one place: either one Helios
+talking to several HAOS instances, or several Helios instances exposing their
+data over an API and aggregating into a single view.