add full stack template submodule

.github/workflows/update-submodule.yml

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+name: Update Submodule
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+jobs:
+  update:
+    name: Update fullstack-template
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Update submodule to latest
+        run: |
+          git submodule update --remote templates/fullstack-template
+
+      - name: Check for changes
+        id: changes
+        run: |
+          if git diff --quiet; then
+            echo "has_changes=false" >> $GITHUB_OUTPUT
+          else
+            echo "has_changes=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create Pull Request
+        if: steps.changes.outputs.has_changes == 'true'
+        uses: peter-evans/create-pull-request@v5
+        with:
+          commit-message: "chore: update fullstack-template submodule"
+          title: "chore: update fullstack-template submodule"
+          body: |
+            Automated update of the `fullstack-template` submodule to the latest commit.
+
+            This PR was created automatically by the update-submodule workflow.
+          branch: auto/update-fullstack-template
+          delete-branch: true

.gitmodules

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+[submodule "templates/fullstack-template"]
+	path = templates/fullstack-template
+	url = https://github.com/CarterPerez-dev/fullstack-template

templates/fullstack-template

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+Subproject commit b6a55e9ab1679ae7d205ca15b19f1accb600eb21