simplify: backend derives lifetime from day totals, app stops sending it

- backend daily PUT: no longer $set lifetime (app's local counter is unreliable after APK wipe)
- backend history GET: derives lifetime as sum of all days' totals, returns it at response level
- app: stops sending lifetime in chunks; reads it from history response
- app: refresh button on consumption pane + 'Şimdi yükle' on log pane (manual cache flush)

Co-Authored-By: Claude <noreply@anthropic.com>

app/src/main/res/values/strings.xml

@@ -107,6 +107,7 @@
     <!-- Call log -->
     <string name="label_call_log">Recent uploads</string>
     <string name="call_log_empty">No upload attempted yet.</string>
+    <string name="btn_flush_now">Şimdi yükle</string>
     <string name="status_starting">Starting…</string>
     <string name="status_running_no_upload">Running — waiting for first upload</string>
     <string name="status_last_upload">Last upload: %1$s (%2$s)</string>