Add security automation: Dependabot, truffleHog secret-scan, and CodeQL workflows

Author: Admin

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    open-pull-requests-limit: 10
+    ignore: []
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10

.github/workflows/codeql-analysis.yml

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+name: "CodeQL"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    - cron: '0 3 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: javascript
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/secret-scan.yml

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+name: Secret scan (truffleHog)
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  trufflehog:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run truffleHog secret scanner
+        uses: dxa4481/trufflehog-action@v2
+        with:
+          flags: '--entropy=False --json'