Run the P2Pool stats sidecar as P2Pool's uid

P2Pool creates /api/local as 0750, so uid 65534 could not read
local/stratum and the endpoint stayed at 503.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tasks/main.yml

@@ -297,8 +297,9 @@
                     memory: 64Mi
                 securityContext:
                   runAsNonRoot: true
-                  runAsUser: 65534
+                  # P2Pool's uid: it creates /api/local as 0750, owner only.
-                  runAsGroup: 65534
+                  runAsUser: 1001
+                  runAsGroup: 1001
                   readOnlyRootFilesystem: true
                   allowPrivilegeEscalation: false
                   capabilities: