Add settings page for managing forecasting API key and URL via UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/es-toolkit/dist/function/flow.js

@@ -0,0 +1,25 @@
+//#region src/function/flow.ts
+/**
+* Creates a new function that executes the given functions in sequence. The return value of the previous function is passed as an argument to the next function.
+*
+* The `this` context of the returned function is also passed to the functions provided as parameters.
+*
+* @param funcs The functions to invoke.
+* @returns Returns the new composite function.
+*
+* @example
+* const add = (x: number, y: number) => x + y;
+* const square = (n: number) => n * n;
+*
+* const combined = flow(add, square);
+* console.log(combined(1, 2)); // 9
+*/
+function flow(...funcs) {
+	return function(...args) {
+		let result = funcs.length ? funcs[0].apply(this, args) : args[0];
+		for (let i = 1; i < funcs.length; i++) result = funcs[i].call(this, result);
+		return result;
+	};
+}
+//#endregion
+exports.flow = flow;