Initial open-source release (MIT): image2api AI gateway

Full Go backend + Vue 3 frontend, OpenAI-compatible API, multi-provider
account pools, billing/admin, Docker one-command deploy with auto HTTPS.

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

frontend/src/credits.js

@@ -0,0 +1,12 @@
+// Credit display helpers. Credits and model prices are stored server-side as
+// integer 积分 (points) — the single unit across the whole app. These helpers
+// only format for display; they do NOT convert units.
+/** Round to an integer 积分 value. */
+export function points(value) {
+  return Math.round(Number(value || 0))
+}
+
+/** "<n> 积分" label with thousands separators. */
+export function pointsLabel(value) {
+  return points(value).toLocaleString('en-US') + ' 积分'
+}