feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/requires-port/.travis.yml

@@ -0,0 +1,19 @@
+sudo: false
+language: node_js
+node_js:
+  - "4"
+  - "iojs"
+  - "0.12"
+  - "0.10"
+script:
+  - "npm run test-travis"
+after_script:
+  - "npm install coveralls@2 && cat coverage/lcov.info | coveralls"
+matrix:
+  fast_finish: true
+notifications:
+  irc:
+    channels:
+      - "irc.freenode.org#unshift"
+    on_success: change
+    on_failure: change