fix: update CI to use Go version from go.mod and fix module path in coverage check

- Replace hardcoded go-version '1.24' with go-version-file: 'go.mod' so CI
  always uses the toolchain version that matches the module's requirements
  (go.mod currently declares go 1.25.6)
- Fix 'Check internal package coverage' step: update grep pattern from
  old module path 'github.com/hits/ExploreDNS/internal' to the renamed
  path 'gitea.hansenits.com.au/hits/ExploreDNS/internal'

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: multica-agent <github@multica.ai>

.gitea/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version-file: 'go.mod'
           cache: true
 
       - name: Vet
@@ -28,7 +28,7 @@ jobs:
 
       - name: Check internal package coverage
         run: |
-          COVERAGE=$(go tool cover -func=coverage.out | grep "^github.com/hits/ExploreDNS/internal" | awk '{print $3}' | sed 's/%//' | awk '{sum+=$1; count++} END {if(count>0) print sum/count; else print 0}')
+          COVERAGE=$(go tool cover -func=coverage.out | grep "^gitea.hansenits.com.au/hits/ExploreDNS/internal" | awk '{print $3}' | sed 's/%//' | awk '{sum+=$1; count++} END {if(count>0) print sum/count; else print 0}')
           echo "Average internal package coverage: ${COVERAGE}%"
 
       - name: Build