Add Renovate configuration for automated dependency management

.github/workflows/renovate.yml

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+name: "Renovate"
+on:
+  workflow_dispatch:
+    inputs:
+      DEBUG:
+        description: "Enable debug logging"
+        type: boolean
+        required: false
+        default: false
+  schedule:
+    - cron: "0 0 * * 1" # Triggers the workflow every Monday at midnight
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5.0.0
+      - name: Self-hosted Renovate
+        uses: renovatebot/github-action@v43.0.15
+        with:
+          token: ${{ secrets.RENOVATE_TOKEN }}
+        env:
+          LOG_LEVEL: ${{ inputs.DEBUG && 'debug' || 'info' }}
+          RENOVATE_REPOSITORIES: '["${{ github.repository }}"]'
+          RENOVATE_COMMIT_MESSAGE_SUFFIX: '{{#unless groupName}}{{#if (equals updateType "digest")}}(from {{currentDigestShort}}){{else}}(from {{currentVersion}}){{/if}}{{/unless}}'
+          RENOVATE_LABELS: '["dependencies"]'
+          RENOVATE_DEPENDENCY_DASHBOARD_LABELS: '["dependencies"]'
+          RENOVATE_EXTENDS: '["config:best-practices","mergeConfidence:all-badges",":pinVersions","security:openssf-scorecard",":prHourlyLimitNone",":separateMultipleMajorReleases",":configMigration"]'
+          RENOVATE_PLATFORM: "github"

renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+}