refactor: remove OIDC config from K8s manifests

OIDC configuration should be managed by the server itself (database-backed),
not injected via K8s secrets. Remove all CAMELEER_OIDC_* env vars from
deployment manifests and the cameleer-oidc secret from CI. The server
defaults to OIDC disabled via application.yml.

This also fixes the Kustomize strategic merge conflict where the feature
overlay tried to set value on an env var that had valueFrom in the base.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -222,14 +222,6 @@ jobs:
             --from-literal=AUTHENTIK_SECRET_KEY="${AUTHENTIK_SECRET_KEY}" \
             --dry-run=client -o yaml | kubectl apply -f -
 
-          kubectl create secret generic cameleer-oidc \
-            --namespace=cameleer \
-            --from-literal=CAMELEER_OIDC_ENABLED="${CAMELEER_OIDC_ENABLED:-false}" \
-            --from-literal=CAMELEER_OIDC_ISSUER="${CAMELEER_OIDC_ISSUER}" \
-            --from-literal=CAMELEER_OIDC_CLIENT_ID="${CAMELEER_OIDC_CLIENT_ID}" \
-            --from-literal=CAMELEER_OIDC_CLIENT_SECRET="${CAMELEER_OIDC_CLIENT_SECRET}" \
-            --dry-run=client -o yaml | kubectl apply -f -
-
           kubectl apply -f deploy/postgres.yaml
           kubectl -n cameleer rollout status statefulset/postgres --timeout=120s
 
@@ -261,10 +253,6 @@ jobs:
           AUTHENTIK_PG_USER: ${{ secrets.AUTHENTIK_PG_USER }}
           AUTHENTIK_PG_PASSWORD: ${{ secrets.AUTHENTIK_PG_PASSWORD }}
           AUTHENTIK_SECRET_KEY: ${{ secrets.AUTHENTIK_SECRET_KEY }}
-          CAMELEER_OIDC_ENABLED: ${{ secrets.CAMELEER_OIDC_ENABLED }}
-          CAMELEER_OIDC_ISSUER: ${{ secrets.CAMELEER_OIDC_ISSUER }}
-          CAMELEER_OIDC_CLIENT_ID: ${{ secrets.CAMELEER_OIDC_CLIENT_ID }}
-          CAMELEER_OIDC_CLIENT_SECRET: ${{ secrets.CAMELEER_OIDC_CLIENT_SECRET }}
 
   deploy-feature:
     needs: docker
@@ -304,7 +292,7 @@ jobs:
         run: kubectl create namespace "$BRANCH_NS" --dry-run=client -o yaml | kubectl apply -f -
       - name: Copy secrets from cameleer namespace
         run: |
-          for SECRET in gitea-registry postgres-credentials opensearch-credentials cameleer-auth cameleer-oidc; do
+          for SECRET in gitea-registry postgres-credentials opensearch-credentials cameleer-auth; do
             kubectl get secret "$SECRET" -n cameleer -o json \
               | jq 'del(.metadata.namespace, .metadata.resourceVersion, .metadata.uid, .metadata.creationTimestamp, .metadata.managedFields)' \
               | kubectl apply -n "$BRANCH_NS" -f -