Add developer API, Prometheus metrics, and community links

docs/vercel-deployment.md

@@ -1,5 +1,16 @@
 # Deploy MineGeo
 
+The scoped developer API requires `20261012124943_developer_api_keys.sql`.
+No additional environment variables are needed. The standalone panel is
+`/dev/api`, `/api/dev` redirects there, and the versioned read-only API is
+`/api/dev/v1`. See [Developer API](developer-api.md) for permissions, rate
+limits, revocation, OpenAPI and Python requests examples.
+
+Admin-only Prometheus/Grafana setup requires `20261012085217_prometheus_metrics.sql`.
+No new Vercel variables are needed: Admins generate a dedicated scrape token in
+Moderation. See [Prometheus and Grafana](prometheus.md) for the copyable config,
+dashboard import, credential rotation, and metric definitions.
+
 The portable Windows Electron client and release process are described in
 [Desktop client](desktop.md). Build and publish the EXE before deploying changes
 to desktop download links. Public desktop releases are included in the upload;
@@ -25,6 +36,10 @@ changing a link. For the hosted site, add the same names as Production Config
 variables in the MineGeo Vercel project, then redeploy. These values are public
 destinations; no Discord bot token or Telegram API key is needed.
 
+The hosted community forum is linked in the header and footer using
+`shared/forum.json`. `MINEGEO_FORUM_URL` can override its public HTTPS address.
+See [Community forum](forum.md) for forum ownership and starter content.
+
 Discord accepts HTTPS links on `discord.gg`, `discord.com`, `www.discord.com`,
 and `discordapp.com`. Telegram accepts `t.me` and `telegram.me`, including group
 invite links. Blank, malformed, or unsupported URLs hide the corresponding