fix(energy): deliver prototype-aligned hydrogen board and acceptance fixes

Co-authored-by: HiFox Agent <agents-noreply@hifox.com>

src/modules/energy/hydrogen-bi-v2/display-format.test.ts

@@ -0,0 +1,13 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { finiteNumber, formatNumber, formatScaled } from "./display-format";
+
+test("能源看板格式化边界区分真实零值与不可用值", () => {
+  for (const value of [null, undefined, NaN, Infinity, -Infinity, "0"]) {
+    assert.equal(finiteNumber(value), null);
+    assert.equal(formatNumber(value), "—");
+    assert.equal(formatScaled(value, 1000), "—");
+  }
+  assert.equal(formatNumber(0), "0.00");
+  assert.equal(formatScaled(0, 1000), "0.00");
+});