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/siginfo/.travis.yml

@@ -0,0 +1,13 @@
+notifications:
+  email: false
+language: node_js
+node_js:
+- node
+deploy:
+  provider: npm
+  email:
+    secure: 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
+  api_key:
+    secure: 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
+  on:
+    tags: true

frontend/node_modules/siginfo/LICENSE

@@ -0,0 +1,13 @@
+Copyright (c) 2017, Emil Bay <github@tixz.dk>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

frontend/node_modules/siginfo/README.md

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+# `siginfo`
+
+[![Build Status](https://travis-ci.org/emilbayes/siginfo.svg?branch=master)](https://travis-ci.org/eemilbayes/siginfo)
+
+> Utility module to print pretty messages on SIGINFO/SIGUSR1
+
+`SIGINFO` on BSD / macOS and `SIGUSR1` on Linux, usually triggered by
+`Ctrl + T`, are by convention used to print information about
+a long running process internal state. Eg. `dd` will tell you how many blocks it
+has written and at what speed, while `xz` will tell you progress, compression
+ratio and estimated time remaining.
+
+This module wraps both signals, checks if the process is connected to TTY and
+lets you do whatever you want.
+
+## Usage
+
+```js
+var siginfo = require('siginfo')
+var pkg = require('./package.json')
+
+siginfo(function () {
+  console.dir({
+    version: pkg.version,
+    uptime: process.uptime()
+  })
+})
+
+```
+
+## API
+
+### `var removeListener = siginfo(queryFn, [force])`
+
+`queryFn` can be used for whatever you want (logging, sending a UDP message, etc.).
+Setting `force = true` will attach the event handlers whether a TTY is present
+or not.
+
+## Install
+
+```sh
+npm install siginfo
+```
+
+## License
+
+[ISC](LICENSE)

frontend/node_modules/siginfo/index.js

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+module.exports = function (query, force) {
+  var isAttached = false
+  if (process.stderr.isTTY || force === true) {
+    isAttached = true
+    process.on('SIGINFO', onsiginfo)
+    process.on('SIGUSR1', onsiginfo)
+  }
+
+  return function () {
+    if (isAttached === true) {
+      process.removeListener('SIGINFO', onsiginfo)
+      process.removeListener('SIGUSR1', onsiginfo)
+      isAttached = false
+    }
+  }
+
+  function onsiginfo () {
+    query()
+  }
+}

frontend/node_modules/siginfo/package.json

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+{
+  "name": "siginfo",
+  "version": "2.0.0",
+  "description": "Utility module to print pretty messages on SIGINFO/SIGUSR1",
+  "main": "index.js",
+  "dependencies": {},
+  "devDependencies": {
+    "standard": "^14.3.4"
+  },
+  "scripts": {
+    "test": "standard"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/emilbayes/siginfo.git"
+  },
+  "keywords": [
+    "siginfo",
+    "sigusr1",
+    "ctrl",
+    "t",
+    "info",
+    "progress",
+    "inspect"
+  ],
+  "author": "Emil Bay <github@tixz.dk>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/emilbayes/siginfo/issues"
+  },
+  "homepage": "https://github.com/emilbayes/siginfo#readme"
+}

frontend/node_modules/siginfo/test.js

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+var siginfo = require('.')
+var pkg = require('./package.json')
+
+var stop = siginfo(function () {
+  console.dir({
+    version: pkg.version,
+    uptime: process.uptime()
+  })
+})
+
+process.stdout.resume()
+
+setTimeout(function () {
+  stop()
+  process.exit(0)
+}, 2000)