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/css-tree/cjs/lexer/prepare-tokens.cjs

@@ -0,0 +1,54 @@
+'use strict';
+
+const index = require('../tokenizer/index.cjs');
+
+const astToTokens = {
+    decorator(handlers) {
+        const tokens = [];
+        let curNode = null;
+
+        return {
+            ...handlers,
+            node(node) {
+                const tmp = curNode;
+                curNode = node;
+                handlers.node.call(this, node);
+                curNode = tmp;
+            },
+            emit(value, type, auto) {
+                tokens.push({
+                    type,
+                    value,
+                    node: auto ? null : curNode
+                });
+            },
+            result() {
+                return tokens;
+            }
+        };
+    }
+};
+
+function stringToTokens(str) {
+    const tokens = [];
+
+    index.tokenize(str, (type, start, end) =>
+        tokens.push({
+            type,
+            value: str.slice(start, end),
+            node: null
+        })
+    );
+
+    return tokens;
+}
+
+function prepareTokens(value, syntax) {
+    if (typeof value === 'string') {
+        return stringToTokens(value);
+    }
+
+    return syntax.generate(value, astToTokens);
+}
+
+module.exports = prepareTokens;