fix: Remove invalid configureUserSettings from harbor-core

The configureUserSettings field contained nginx configuration
('http2_push_preload on;') which was incorrectly being used as
CONFIG_OVERWRITE_JSON. This caused harbor-core to crash with a
JSON parse error.

CONFIG_OVERWRITE_JSON expects valid JSON for Harbor configuration
overrides, not nginx snippets. Removing this field to fix the
CrashLoopBackOff.

cluster/platform/harbor/values.yaml

@@ -125,9 +125,6 @@ core:
     tag: "v2.15.1"
   replicas: 1
   # Core secret auto-generated by Harbor Helm chart
-  # Enable HTTP/2 for better performance
-  configureUserSettings: |-
-    http2_push_preload on;
   resources:
     requests:
       memory: 512Mi