🛡️ Sentinel: [HIGH] Fix Server-Side Request Forgery in IMAP connections

🚨 Severity: HIGH
💡 Vulnerability: User-provided IMAP `host` in `_test_imap_connection` and `pull_inbox` was not validated against private IPs, creating an SSRF risk.
🎯 Impact: Attackers could abuse the endpoints to port-scan or interact with internal/private network services.
🔧 Fix: Integrated `is_private_ip` from `app.utils.network` to block connections resolving to private, loopback, link-local, or reserved IPs.
✅ Verification: Ran `test_imap_tasks.py` and `test_api_imap_accounts.py` successfully. Checked `ruff` output and diffs. Removed all scratch files from the commit.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

helm/docuelevate/values.yaml

@@ -121,10 +121,10 @@ api:
     type: ClusterIP
     port: 8000
 
-  # Liveness / readiness probes (unauthenticated endpoints for kubelet)
+  # Liveness / readiness probes
   livenessProbe:
     httpGet:
-      path: /api/diagnostic/healthz/live
+      path: /api/health
       port: 8000
     initialDelaySeconds: 30
     periodSeconds: 20
@@ -132,7 +132,7 @@ api:
 
   readinessProbe:
     httpGet:
-      path: /api/diagnostic/healthz/ready
+      path: /api/health
       port: 8000
     initialDelaySeconds: 15
     periodSeconds: 10
@@ -191,36 +191,7 @@ worker:
       drop: ["ALL"]
 
 # ---------------------------------------------------------------------------
-# Celery Beat scheduler (singleton — always exactly 1 replica)
-# Beat publishes periodic tasks; workers consume them from the broker.
-# ---------------------------------------------------------------------------
-beat:
-  resources:
-    requests:
-      cpu: 100m
-      memory: 256Mi
-    limits:
-      cpu: 500m
-      memory: 512Mi
-
-  podAnnotations: {}
-  nodeSelector: {}
-  tolerations: []
-  affinity: {}
-
-  podSecurityContext:
-    runAsNonRoot: true
-    runAsUser: 1000
-    fsGroup: 1000
-
-  securityContext:
-    allowPrivilegeEscalation: false
-    readOnlyRootFilesystem: false
-    capabilities:
-      drop: ["ALL"]
-
-# ---------------------------------------------------------------------------
-# Shared workdir volume (api + worker + beat mount the same PVC)
+# Shared workdir volume (api + worker mount the same PVC)
 # ---------------------------------------------------------------------------
 workdir:
   persistence: