fix(rflood): add liveness probe and raise memory limit to 4Gi

rtorrent periodically freezes blocking Flood's XMLRPC calls (activity-stream
and client/settings hang). Root causes: pieces.memory.max=1800M near the 2Gi
container limit; no liveness probe to trigger pod restart on hang.

- Liveness probe: exec rtxmlrpc system.time_seconds with 10s timeout; restart
  pod after 3 consecutive failures (every 30s check)
- Default memory limit raised from 2Gi to 4Gi

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

rflood/templates/deployment.yaml

@@ -55,6 +55,15 @@ spec:
               protocol: UDP
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
+          {{- if .Values.livenessProbe.enabled }}
+          livenessProbe:
+            exec:
+              {{- toYaml .Values.livenessProbe.exec | nindent 14 }}
+            initialDelaySeconds: {{ .Values.livenessProbe.initialDelaySeconds }}
+            periodSeconds: {{ .Values.livenessProbe.periodSeconds }}
+            timeoutSeconds: {{ .Values.livenessProbe.timeoutSeconds }}
+            failureThreshold: {{ .Values.livenessProbe.failureThreshold }}
+          {{- end }}
           volumeMounts:
             - name: config
               mountPath: /config