chore: move lms to myclassroomio.com and use approximated for custom

domain

apps/tenant-router/README.md

@@ -2,10 +2,10 @@
 
 Cloudflare Worker that fronts every browser-facing ClassroomIO host:
 
-- `*.classroomio.school/*` — free-tier tenant sites
-- `classroomio.school/*` — apex (301 → `classroomio.com`)
+- `*.myclassroomio.com/*` — free-tier tenant sites
+- `myclassroomio.com/*` — apex (301 → `classroomio.com`)
 - `app.classroomio.com/*` — admin dashboard
-- BYOD customer domains via Cloudflare for SaaS
+- BYOD customer domains via Approximated (their proxy forwards to `cio-api.onrender.com` directly, not through this Worker)
 
 The Worker forwards each request to one of two Render services based on path:
 
@@ -23,7 +23,7 @@ the API. Example: a browser request to
 It preserves the original host as `X-Forwarded-Host` so:
 
 - The dashboard's SvelteKit adapter-node reads it via `HOST_HEADER=x-forwarded-host` and `event.url.host` becomes the tenant/admin/BYOD host.
-- Better Auth on the API emits session cookies without a `Domain` attribute (see `packages/db/src/auth.ts` — `crossSubDomainCookies: { enabled: false }`), so the browser scopes each session to the exact host it called. Tenants on `acme.classroomio.school`, the admin app on `app.classroomio.com`, and BYOD `learn.acme.com` each get host-only sessions.
+- Better Auth on the API emits session cookies without a `Domain` attribute (see `packages/db/src/auth.ts` — `crossSubDomainCookies: { enabled: false }`), so the browser scopes each session to the exact host it called. Tenants on `acme.myclassroomio.com`, the admin app on `app.classroomio.com`, and BYOD `learn.acme.com` each get host-only sessions.
 
 ## Deploy
 
@@ -43,33 +43,22 @@ pnpm --filter @cio/tenant-router tail
 |---|---|
 | `DASHBOARD_UPSTREAM_HOST` | `.onrender.com` host of the dashboard service (no scheme) |
 | `API_UPSTREAM_HOST` | `.onrender.com` host of the API service |
-| `APEX_REDIRECT_TARGET` | URL to redirect `classroomio.school` apex to (default `https://classroomio.com`) |
+| `APEX_REDIRECT_TARGET` | URL to redirect `myclassroomio.com` apex to (default `https://classroomio.com`) |
 
 Update the values in `wrangler.toml` after looking them up in the Render dashboard.
 
 ## Cloudflare DNS expected setup
 
-`classroomio.school` zone (new):
+`myclassroomio.com` zone:
 
 - `*` CNAME → any valid target, **Proxied**
 - `@` CNAME → any valid target, **Proxied** (Worker serves the 301)
-- `cname` CNAME → any valid target, **Proxied** — this is the value BYOD customers point their CNAME at
 
 `classroomio.com` zone:
 
 - `app` CNAME → **Proxied** so the route binds
 - `api` CNAME → **DNS only** (server-to-server callers and webhooks bypass the Worker)
-- The old wildcard `*` CNAME on `classroomio.com` should be deleted — tenant traffic now belongs on `classroomio.school`.
 
-## Cloudflare for SaaS (BYOD)
+## BYOD custom domains
 
-On the `classroomio.school` zone:
-
-- **SSL/TLS → Custom Hostnames**: enabled
-- **Fallback Origin**: `cname.classroomio.school` — BYOD traffic lands on the Worker route and is forwarded through the same code path as `*.classroomio.school`.
-
-The API uses these env vars (`apps/api/src/services/org/domain.ts`):
-
-- `CLOUDFLARE_CUSTOM_HOSTNAMES_API_TOKEN` — Cloudflare API token scoped to the `classroomio.school` zone with `Zone → SSL and Certificates → Edit` + `Zone → Zone → Read`.
-- `CLOUDFLARE_CUSTOM_HOSTNAMES_ZONE_ID` — Zone ID for `classroomio.school`.
-- `CLOUDFLARE_CUSTOM_HOSTNAME_CNAME_TARGET=cname.classroomio.school`.
+Handled by [Approximated](https://approximated.app/), not this Worker. Cloudflare for SaaS can't front a Render origin (Render itself runs on Cloudflare), so we use Approximated's dedicated edge cluster instead. See `apps/api/src/services/org/domain.ts` for the integration. Customers point an A record at the IP Approximated returns; the proxy forwards directly to `cio-api.onrender.com`.