Server: InfluxDB 2 storage, live telemetry endpoint, ABRP forwarder

- MongoDB replaced by InfluxDB 2 (one bucket, installationId tag).
  Consumption is stored per chunk at its recordedAt and summed on read,
  so a chunk the car re-sends from its cache overwrites itself instead
  of being counted twice ($inc did count it twice). Lifetime is a
  running total derived on read.
- POST /v1/telemetry takes batches of samples in ABRP's tlm fields; every
  field is bounded, unknown fields are dropped, unread signals stay absent.
- After a successful write the newest fresh sample is forwarded to ABRP
  with ABRP_API_KEY / ABRP_USER_TOKEN from the server environment; rate
  limited, never queued. The car no longer needs ABRP credentials.
- Self-hosting: standalone output, Dockerfile (tests run in the build,
  runs as UID 10001), .env.example and README for the new setup.
- Dev shell gains Node 22 and InfluxDB 2.

Verified locally against InfluxDB 2.7.12: all endpoints, retry
idempotency, and the dashboard pages. Unit tests: 17 pass.

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

web/test/days.test.ts

@@ -0,0 +1,37 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { aggregateDays } from "../src/lib/days.ts";
+
+const ID = "6f1a2b3c-4d5e-4f60-8a9b-0c1d2e3f4a5b";
+const chunk = (date: string, at: number, km: number, kwh: number, sohPercent?: number) => ({
+  installationId: ID,
+  date,
+  recordedAt: new Date(at),
+  day: { km, kwh, hours: km / 50, socDrop: kwh / 0.6 },
+  ...(sohPercent === undefined ? {} : { sohPercent }),
+});
+
+test("adds chunks up per day, newest day first, with a running lifetime", () => {
+  const days = aggregateDays([
+    chunk("2026-10-16", 1_000, 10, 2),
+    chunk("2026-10-17", 3_000, 5, 1),
+    chunk("2026-10-16", 2_000, 20, 3),
+  ]);
+  assert.deepEqual(days.map((d) => d.date), ["2026-10-17", "2026-10-16"]);
+  assert.equal(days[1].day.km, 30);
+  assert.equal(days[1].day.kwh, 5);
+  assert.equal(days[1].recordedAt.getTime(), 2_000);
+  assert.equal(days[1].lifetime?.km, 30);
+  assert.equal(days[0].lifetime?.km, 35);
+  assert.equal(days[0].lifetime?.kwh, 6);
+});
+
+test("the newest manual SoH of a day wins, and a day without one has none", () => {
+  const days = aggregateDays([
+    chunk("2026-10-16", 2_000, 1, 1, 96),
+    chunk("2026-10-16", 1_000, 1, 1, 98),
+    chunk("2026-10-17", 3_000, 1, 1),
+  ]);
+  assert.equal(days[1].sohPercent, 96);
+  assert.equal("sohPercent" in days[0], false);
+});