ci: switch to CodeQL Advanced Setup

- Add custom codeql.yml workflow
- Configure to use codeql-config.yml
- Exclude js/missing-rate-limiting rule (false positive)
  Rate limiting is implemented via @fastify/rate-limit plugin

.github/codeql/codeql-config.yml

@@ -5,12 +5,13 @@ paths-ignore:
   - "**/node_modules/**"
   - "**/dist/**"
   - "**/*.test.ts"
+  - "**/test/**"
 
 # Query filters to suppress false positives
-# The rate limiting alerts are false positives because we use @fastify/rate-limit plugin
-# which CodeQL doesn't recognize. The plugin is registered globally in index.ts
-# and route-specific limits are applied via config.rateLimit option.
 query-filters:
+  # Rate limiting IS implemented via @fastify/rate-limit plugin (registered in index.ts)
+  # Route-specific limits are applied via config.rateLimit option
+  # CodeQL doesn't recognize this Fastify-specific pattern
   - exclude:
       id: js/missing-rate-limiting
-      # We use @fastify/rate-limit which CodeQL doesn't detect
+

.github/workflows/codeql.yml

@@ -0,0 +1,41 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: "0 6 * * 1" # Weekly on Monday at 6am UTC
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [javascript-typescript]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+          config-file: ./.github/codeql/codeql-config.yml
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v3
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{ matrix.language }}"