feat(web): separate build sources and localize time

web/src/lib/buildInfo.ts

@@ -1 +1,37 @@
-export const buildInfo = __WEBDROP_BUILD_INFO__;
+const shanghaiTime = new Intl.DateTimeFormat('en-CA', {
+  timeZone: 'Asia/Shanghai',
+  year: 'numeric',
+  month: '2-digit',
+  day: '2-digit',
+  hour: '2-digit',
+  minute: '2-digit',
+  hourCycle: 'h23',
+});
+
+function shortCommit(commit: string): string {
+  return commit === 'unknown' ? commit : commit.slice(0, 7);
+}
+
+function knownTag(tag: string): string {
+  return tag === 'unknown' ? '' : tag;
+}
+
+function formatShanghai(iso: string): string {
+  const date = new Date(iso);
+  if (Number.isNaN(date.getTime())) return '未知';
+
+  const parts = Object.fromEntries(shanghaiTime.formatToParts(date).map(({ type, value }) => [type, value]));
+  return `${parts.year}-${parts.month}-${parts.day} ${parts.hour}:${parts.minute}`;
+}
+
+const source = __WEBDROP_BUILD_INFO__;
+
+export const buildInfo = {
+  frontendVersion: source.frontendVersion,
+  frontendCommit: shortCommit(source.frontendCommit),
+  frontendTag: knownTag(source.frontendTag),
+  backendCommit: shortCommit(source.backendCommit),
+  backendTag: knownTag(source.backendTag),
+  builtAt: source.builtAt,
+  builtAtShanghai: formatShanghai(source.builtAt),
+};