sec: implement comprehensive security suite (Dependabot, CodeQL, and .gitignore hardening)

Author: Edge-Explorer

.github/dependabot.yml

@@ -0,0 +1,18 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/frontend"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+
+  - package-ecosystem: "pip"
+    directory: "/backend"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/codeql.yml

@@ -0,0 +1,40 @@
+name: "InterviewAI Security Scan (CodeQL)"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '30 18 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: "ubuntu-latest"
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'javascript', 'python' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v3
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{matrix.language}}"

.gitignore

@@ -1,5 +1,36 @@
-node_modules/
+# --- INTERVIEWAI MASTER GITIGNORE ---
+
+# Python
 backend/venv/
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.pytest_cache/
+.coverage
+htmlcov/
+.mypy_cache/
 .env
-*.log
+backend/.env
+backend/data/*.json.bak
+
+# Node / React
+node_modules/
+frontend/node_modules/
+dist/
+frontend/dist/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.eslintcache
+
+# OS / IDE
+.vscode/
+.idea/
 .DS_Store
+Thumbs.db
+*.log
+*.sqlite3
+
+# Docker
+.dockerignore