Harden Anker Solix OCPP control (token hashing, step-up, audit, TLS)

Security pass over the OCPP charger-control feature added in a1519f6, since
remotely actuating a physical charger is a real side effect.

Token hygiene:
  - Per-charger control tokens are stored as SHA-256 hashes + a last-4 hint,
    never plaintext. The token is shown once at generation; the status endpoint
    returns only the hint. Added a revoke endpoint that also drops any live
    session using the revoked token.

Step-up + confirmation:
  - Destructive actions (reset, unlock) require confirm:true AND a password
    re-authentication (verified against PocketBase). The Charging UI collects the
    password inline for reset.
  - Per user+charger rate limit (30/min) on control commands.

Transport + provenance:
  - OCPP_REQUIRE_TLS (default on) rejects plaintext ws:// charger connections;
    OCPP_PUBLIC_URL pins the advertised endpoint instead of trusting request
    headers.
  - Proxy-mode upstream URL is validated against a *.anker.com allowlist, so a
    spoofed ocpp-info response can't redirect the proxy.

Durable audit:
  - New control_audit PocketBase collection (added to setup-pocketbase.mjs);
    every control action, token generate/revoke and charger connect is persisted
    best-effort in addition to a structured log line.

Startup:
  - The control-token index is warmed from PocketBase on startup so a charger
    reconnecting after a restart resolves immediately.

Tests:
  - Unit tests for token hashing/eviction/revoke (no plaintext at rest),
    rate limiter, destructive-action classifier, upstream allowlist, TLS
    enforcement, and re-auth guards. A full-stack E2E (control_e2e_test.go)
    drives the real Handler with a stand-in PocketBase and a simulated charge
    point, proving step-up (400/401/200) and audit persistence end to end.

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

Web App/web/src/api.js

@@ -247,6 +247,8 @@ export const api = {
   getAnkerControl: (sn) => request(`/integrations/anker-solix/chargers/${encodeURIComponent(sn)}/control`),
   ankerControlToken: (sn) =>
     request(`/integrations/anker-solix/chargers/${encodeURIComponent(sn)}/control/token`, { method: "POST" }),
+  ankerControlRevoke: (sn) =>
+    request(`/integrations/anker-solix/chargers/${encodeURIComponent(sn)}/control/token`, { method: "DELETE" }),
   ankerControlAction: (sn, action, body = {}) =>
     request(`/integrations/anker-solix/chargers/${encodeURIComponent(sn)}/${action}`, {
       method: "POST",