Add admin docs and Android admin scaffold

CHECKLIST.md

@@ -6,8 +6,10 @@
 
 ## Android admin app
 
-- [ ] Kotlin + Compose app
-- [ ] Store `ADMIN_TOKEN` securely (EncryptedSharedPreferences/Keystore)
-- [ ] Logs list/search/detail using `/api/logs` + `/api/logs/:request_id`
-- [ ] Stats views using `/api/stats/*`
-- [ ] Base URL config for local network host (e.g. `http://192.168.88.2:8787`)
+- [x] Kotlin + Compose app (project scaffold)
+- [ ] Add gradle wrapper jar (or generate via Android Studio)
+- [x] Store `ADMIN_TOKEN` securely (EncryptedSharedPreferences)
+- [x] Logs list/search/detail using `/api/logs` + `/api/logs/:request_id`
+- [x] Stats summary view using `/api/stats/summary`
+- [x] Base URL config for local network host (e.g. `http://192.168.88.2:8787`)
+- [ ] Timeseries + model stats screens