OTA steps 3-5: Update Service, Probation and Rollback, Update from SD

- EcdsaVerifier (mbedTLS, embedded public key) and EspOtaSink (writes
  the inactive app slot, esp_ota_end validates the image, then sets
  the boot partition)
- UpdateService: listens on TCP 3232 (and mDNS roro9stack-<id>) while
  Wi-Fi is Connected; streams into UpdateParser; replies OK/ERR to the
  sender; remembers the pending version so a Rollback is reported
  after the reboot
- Probation (host-tested): confirm after the first frame + 30 s + Wi-Fi
  (if configured); roll back if configured Wi-Fi never connects in 3 min
- Main loop: full-screen progress while receiving; restart once
  installed, waiting up to 60 s for Text Entry to end
- Settings > Firmware: version, Probation status, push address and
  name, and the .ota files in /updates on the SD card to install
- StorageService.runJob() runs work on the storage task (SD installs)
- wifi status prints IP and running version; RORO_TEST_CRASH test hook

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

src/services/wifi_service.cpp

@@ -7,6 +7,10 @@
 namespace roro {
 
 
+std::string WifiService::ip() const {
+    return controller_.state() == WifiController::State::Connected ? WiFi.localIP().toString().c_str() : "";
+}
+
 int WifiService::rssi() const {
     return controller_.state() == WifiController::State::Connected ? WiFi.RSSI() : 0;
 }