Fix CI: reset --hard + clean to repair stale submodule state

git pull alone doesn't convert a leftover submodule directory to a
regular directory. reset --hard + clean -fd ensures the working tree
matches origin/main exactly.

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

.gitea/workflows/deploy.yml

@@ -15,7 +15,9 @@ jobs:
       - name: Pull code
         run: |
           if [ -d "${{ vars.DEPLOY_DIR }}/.git" ]; then
-            git -C ${{ vars.DEPLOY_DIR }} pull
+            git -C ${{ vars.DEPLOY_DIR }} fetch origin main
+            git -C ${{ vars.DEPLOY_DIR }} reset --hard origin/main
+            git -C ${{ vars.DEPLOY_DIR }} clean -fd
           else
             git clone http://192.168.1.4:3000/christoph/pamietnik.git ${{ vars.DEPLOY_DIR }}
           fi