Wire the Anker Solix EV charger into the per-user integration cascade

Expose the anker-solix plugin to end users the same way as Toyota: a
global -> org -> user settings cascade so everyone can run it under their
own Anker account, with a superadmin (and org admin) able to impose
settings from above.

API Server: integrations_ankersolix.go mirrors integrations.go with the
Anker fields (email + password resolve as a pair from the highest layer,
country resolves on its own), plus GET/PUT/health/chargers routes under
/api/integrations/anker-solix. Secrets and inherited emails are masked;
the live probe runs server-side under the resolved credentials.

Web App: api.js client calls, a second Integrations card in Settings.vue
(scope switch, enable toggle, email/password/country with locked-field
inheritance notes, save + test), and the en.json strings.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Web App/web/src/api.js

@@ -231,6 +231,14 @@ export const api = {
   saveToyota: (body) => request("/integrations/toyota", { method: "PUT", body: JSON.stringify(body) }),
   testToyota: () => request("/integrations/toyota/health", { method: "POST" }),
 
+  // Anker Solix (V1 Smart EV Charger) — same cascade as Toyota. getAnkerSolix
+  // returns the resolved view (effective/own/locked per field, secrets and
+  // inherited emails masked); saveAnkerSolix writes the caller's editable layer;
+  // testAnkerSolix runs a live login probe under the resolved credentials.
+  getAnkerSolix: () => request("/integrations/anker-solix"),
+  saveAnkerSolix: (body) => request("/integrations/anker-solix", { method: "PUT", body: JSON.stringify(body) }),
+  testAnkerSolix: () => request("/integrations/anker-solix/health", { method: "POST" }),
+
   // Settings — advanced / danger zone
   exportData: () => requestBlob("/me/export"),
   importData: (payload) => request("/me/import", { method: "POST", body: JSON.stringify(payload) }),