fix: Fixed baked api url

claude.md

@@ -649,7 +649,7 @@ cd /opt/vantage && docker compose -f docker-compose.yml -f docker-compose.site.y
 
 `shared/` fans out to all three Go images because each of their Dockerfiles copies `shared/` from a root context — **if a fourth service ever imports `shared/`, add it to that list or it will ship stale**. A change to the workflow file rebuilds everything, since a build arg is baked into the image. So does anything that leaves no trustworthy base commit: a manual `workflow_dispatch`, a new branch, or a force-push whose old head is gone.
 
-The gap this leaves: **changing a repo variable pushes no commit, so nothing rebuilds.** After editing `API_URL`, `ADMIN_API_URL`, `HQ_URL` or `ADMIN_ENV`, run the workflow manually — that is what `workflow_dispatch` is there for. Base images also stop being refreshed on a service nobody touches; a periodic manual run covers that.
+The gap this leaves: **changing a repo variable pushes no commit, so nothing rebuilds.** After editing `ADMIN_API_URL`, `HQ_URL` or `ADMIN_ENV`, run the workflow manually — that is what `workflow_dispatch` is there for. Base images also stop being refreshed on a service nobody touches; a periodic manual run covers that.
 
 ### Tagging
 
@@ -666,7 +666,7 @@ git push origin main                                    # server + web deploy
 | `REGISTRY_USER`         | Secret   | Gitea username                                                                                                                                                                                                                                             |
 | `REGISTRY_PASSWORD`     | Secret   | Gitea token, `write:packages`                                                                                                                                                                                                                              |
 | `DOCKER_HOST`           | Variable | registry host used for image tags                                                                                                                                                                                                                          |
-| `API_URL`               | Variable | baked into the `web` image at build time                                                                                                                                                                                                                   |
+| `API_URL`               | **not** a CI variable | `web` reads it at **runtime**, from the container environment — `next.config.ts` is evaluated when `server.js` boots in standalone mode, and the rewrites it feeds are server-side, never browser-side. Default `http://localhost:8080`; compose sets `http://server:8080`. `NEXT_PUBLIC_API_URL` is still honoured as a fallback for existing deployments. |
 | `SITE_API_URL`          | Variable | **browser-reachable** sitesvc URL, baked into the `site` image. Required — if empty, both forms report "not connected" and submit nowhere. Must also be in sitesvc's `SITE_ORIGIN`.                                                                        |
 | `SITE_CONTACT_EMAIL`    | Variable | optional; address shown when a form is misconfigured                                                                                                                                                                                                       |
 | `ADMIN_API_URL`         | Variable | **browser-reachable** admin URL, baked into **both** the `adminsite` and `site` images — `site/start` posts account signups straight to admin. Same footgun as `SITE_API_URL`: wrong here and every request fails at runtime with the not-connected panel. |