fix: client perms, @everyone/@channel, docs, unit tests

- usePermissions ORs current user roles + @everyone only (not all server roles)
- cache myRolesByServer; load on active server; refresh after self role edit
- gate/notify @everyone and @channel; plain @username push; special mention UI
- refresh FEATURE_PARITY (DMs exist; drop stale critical gaps)
- README production deploy notes dumpster.service
- unit tests for permission bits and broadcast mention tokens

README.md

@@ -161,6 +161,30 @@ Users are prompted to enable notifications on login. On iOS, the prompt requires
 
 Full documentation: [dumpsterChat wiki](ssh://git@git.dustin.coffee:2222/hobokenchicken/dumpsterChat.wiki.git)
 
+## Production Deploy (SBC / 172.20.0.125)
+
+App lives at `/opt/dumpsterChat`. systemd unit name is **`dumpster.service`** (not `dumpsterChat`).
+
+```bash
+# Build locally
+CGO_ENABLED=0 go build -o dumpster-server ./cmd/server
+(cd web && npm run build)
+
+# Ship binary + web assets
+scp dumpster-server root@172.20.0.125:/tmp/dumpster-server-new
+rsync -av --delete web/dist/ root@172.20.0.125:/opt/dumpsterChat/web/dist/
+
+ssh root@172.20.0.125 '
+  install -m 755 /tmp/dumpster-server-new /opt/dumpsterChat/dumpster-server
+  systemctl restart dumpster
+  systemctl is-active dumpster
+'
+```
+
+Logs: `journalctl -u dumpster -f`  
+Health: `curl -s http://127.0.0.1:8080/` (or your API health route)  
+Public: Caddy → `dumpster.dustin.coffee` → `172.20.0.125:8080`
+
 ## License
 
 AGPLv3