Add secret management guide, client-side performance monitoring, and search accessibility enhancements

- Introduced a comprehensive Secret Management Guide detailing best practices, secret classification, development setup, production management, rotation procedures, and emergency protocols.
- Implemented a client-side performance monitoring script to track various metrics including page load performance, paint metrics, layout shifts, and memory usage.
- Enhanced search accessibility with keyboard navigation support for search results, ensuring compliance with WCAG standards and improving user experience.

.github/workflows/dependency-update.yml

@@ -0,0 +1,53 @@
+name: Dependency Update Check
+
+on:
+  schedule:
+    - cron: '0 0 * * 1'  # Weekly on Monday at midnight UTC
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install UV
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+
+      - name: Update Dependencies
+        working-directory: backend
+        run: |
+          uv lock --upgrade
+          uv sync
+
+      - name: Run Tests
+        working-directory: backend
+        run: |
+          uv run manage.py test
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v5
+        with:
+          commit-message: "chore: update dependencies"
+          title: "chore: weekly dependency updates"
+          body: |
+            Automated dependency updates.
+
+            This PR was automatically generated by the dependency update workflow.
+
+            ## Changes
+            - Updated `uv.lock` with latest compatible versions
+
+            ## Checklist
+            - [ ] Review dependency changes
+            - [ ] Verify all tests pass
+            - [ ] Check for breaking changes
+          branch: "dependency-updates"
+          labels: dependencies