Document admin page and refresh architecture docs

docs/admin.md

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+# DorkNet Admin Page
+
+The admin page is the browser operations console for DorkNet. In the
+microservices deployment it lives at `https://admin.<domain>/` and is
+served by the `web` service from the built Vite SPA assets.
+
+The admin backend endpoints are under `/api/admin/v1`. Requests from the
+SPA are same-origin, so `https://admin.<domain>/api/admin/v1/*` is also
+handled by the `web` service route on the admin host. The same
+`/api/admin/*` route family is available as a path-owned moderation slice
+for non-admin-host routing, so `/internal/routes` can show moderation as
+the owner for that path family.
+
+## Runtime Routing
+
+| Item | Value |
+|---|---|
+| SPA source | `DorkNet.Server/admin-ui` |
+| Build output | `DorkNet.Server/wwwroot/admin` |
+| Container path | `/app/wwwroot/admin` |
+| Public browser host | `admin.<domain>` |
+| API base used by the SPA | `/api/admin/v1` |
+| Login endpoint | `POST /api/admin/v1/login` |
+| Same-origin admin-host service | `web` |
+| Path-routed admin API slice | `moderation` |
+
+`DorkNet.Gateway` preserves the original Host header when it proxies to
+backend services. That matters for the admin page: the `admin.<domain>`
+host route must reach `web`, and `web` must contain
+`/app/wwwroot/admin/index.html`.
+
+## Authentication
+
+The first account created on a fresh database is promoted to admin so
+there is always a bootstrap operator. The login form posts to
+`/api/admin/v1/login`; the SPA stores the returned values in browser
+`localStorage`:
+
+| Key | Contents |
+|---|---|
+| `dorknet.admin.token` | DorkNet admin JWT |
+| `dorknet.admin.me` | Admin identity object used by the layout |
+
+Every admin API request sends `Authorization: Bearer <token>`. Protected
+actions are guarded by `AdminOnlyAttribute`, which checks the resolved
+player row still has `IsAdmin = true`. A `401` clears the local session
+and sends the browser back to login.
+
+If the admin host is public, put it behind Cloudflare Access or an
+equivalent outer access control. The DorkNet JWT is still required after
+that outer check.
+
+## Navigation
+
+| Section | Routes | Workflows |
+|---|---|---|
+| Overview | `/` | Live ops dashboard, online players, active sessions, quick kick/ban/broadcast actions |
+| Moderation | `/players` | Player directory, bans, reports, per-player ban/grant/gift/password/avatar/account actions |
+| Activity | `/activity` | Admin audit log and per-player request logs |
+| Content | `/rooms`, `/rooms/:id`, `/import-room`, `/content` | Room list/detail, room import, instances, leaderboards, community board, loading tips |
+| Operations | `/broadcast`, `/settings` | Server broadcast, server toggles, signup codes, weekly challenges, Play menu tags, Rec Center doors, game config values |
+
+Several older admin URLs are kept as redirects:
+
+| Old route | Current route |
+|---|---|
+| `/bans` | `/players?tab=bans` |
+| `/reports` | `/players?tab=reports` |
+| `/gift`, `/passwords`, `/grants` | `/players` |
+| `/audit` | `/activity?tab=audit` |
+| `/logs` | `/activity?tab=logs` |
+| `/rr-originals`, `/instances`, `/leaderboards` | `/rooms` |
+| `/community` | `/content?tab=community` |
+| `/loading-tips` | `/content?tab=tips` |
+| `/signup-codes` | `/settings?tab=signup` |
+
+`/import-room-legacy` still exists for the legacy room importer.
+
+## Build And Deploy
+
+The service Dockerfile builds the admin SPA for service images that need
+static assets. In the microservices stack the `web` image must include:
+
+```text
+/app/wwwroot/admin/index.html
+/app/wwwroot/admin/assets/*
+```
+
+The admin SPA calls relative URLs, so it does not need a configured API
+origin as long as the browser is opened on `https://admin.<domain>/`.
+
+The native admin mobile app points at the same public admin host; see
+[`../DorkNet.AdminMobile/README.md`](../DorkNet.AdminMobile/README.md).
+
+## Smoke Checks
+
+Check the static host:
+
+```bash
+curl -I https://admin.yourdomain.com/
+```
+
+Check that protected admin API routing is alive. A `401` is expected
+without a valid admin token:
+
+```bash
+curl -i https://admin.yourdomain.com/api/admin/v1/stats
+```
+
+Check the built assets inside the running `web` container:
+
+```bash
+docker exec <web-container> sh -lc 'find /app/wwwroot/admin -maxdepth 2 -type f | sort | head -50'
+```
+
+Useful logs:
+
+```bash
+docker logs <stack>-gateway-1 --tail=200
+docker logs <stack>-web-1 --tail=200
+docker logs <stack>-moderation-1 --tail=200
+```
+
+For normal browser admin traffic, start with `gateway` and `web`.
+Check `moderation` when you are testing `/api/admin/*` through a
+non-admin host such as `api.<domain>`.
+
+## Troubleshooting
+
+| Symptom | Check |
+|---|---|
+| `admin.<domain>/` returns 404 | `web` logs for `probe="/app/wwwroot/admin/index.html" exists=False`; rebuild/redeploy the `web` image |
+| Admin page loads but actions 404 | Gateway `/internal/routes`, then whether the request host is `admin.<domain>` or a path-routed host |
+| Login or actions return 401 | Token expired, local session cleared, or the player no longer has `IsAdmin = true` |
+| Browser spins forever | Open the browser network tab, then check `gateway` and `web` logs for the stuck URL |
+| Upload/import fails near 100 MB | Use the chunked importer; the SPA uses 50 MB chunks to stay below Cloudflare request limits |