Fix gitleaks CI failure: use full clone for secret scanning

gitleaks-action requires commit history to scan PR diffs.
Shallow clone (fetch-depth: 1) causes fatal SHA resolution errors.

Author: heznpc

.github/workflows/ci.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
 
       - name: Scan for secrets
         uses: gitleaks/gitleaks-action@v2