fix(ci): remove dart pub audit step (unsupported in runner SDK)

The stable Flutter SDK on the CI runner does not include
the `dart pub audit` subcommand. Trivy scan still covers
dependency security.

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

.gitea/workflows/ci.yaml

@@ -96,9 +96,6 @@ jobs:
         run: dart pub outdated
         continue-on-error: true
 
-      - name: Security audit
-        run: dart pub audit
-
       - name: Trivy filesystem scan
         run: |
           set -e

.gitea/workflows/release.yaml

@@ -94,9 +94,6 @@ jobs:
         run: dart pub outdated
         continue-on-error: true
 
-      - name: Security audit
-        run: dart pub audit
-
       - name: Trivy filesystem scan
         run: |
           set -e

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes to HouseHoldKeeper are documented in this file.
 
 ### Fixed
 - Install jq before Flutter setup in CI and release workflows (required by subosito/flutter-action)
+- Remove `dart pub audit` step (not available in stable Flutter SDK on runner)
 
 ## [1.1.4] - 2026-03-17