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/fp/array/flatMapDeep.mjs

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+import { flatMapDeep as flatMapDeep$1 } from "../../array/flatMapDeep.mjs";
+import { combineEagerAndLazyFunctions, createLazyFunction } from "../_internal/lazy.mjs";
+//#region src/fp/array/flatMapDeep.ts
+/**
+* Creates a function that maps each element and recursively flattens the mapped values.
+*
+* The iteratee receives each value and index. The returned function is lazy-capable inside
+* {@link pipe}; a trailing short-circuiting operator can stop before later input values are mapped.
+*
+* @template T - The type of elements in the input array.
+* @template U - The type returned by the iteratee before recursive flattening.
+* @param iteratee - Called with each value and index to produce values to flatten.
+* @returns A function that maps a readonly array to a deeply flattened array.
+*
+* @example
+* import { flatMapDeep, pipe } from 'es-toolkit/fp';
+*
+* pipe([1, 2], flatMapDeep(value => [[value, value * 10]]));
+* // => [1, 10, 2, 20]
+*/
+function flatMapDeep(iteratee) {
+	function flatMapDeepEager(array) {
+		return flatMapDeep$1(array, (item, index) => iteratee(item, index));
+	}
+	return combineEagerAndLazyFunctions(flatMapDeepEager, createLazyFunction((value, index, emit) => {
+		emitDeep(iteratee(value, index), emit);
+	}));
+}
+function emitDeep(value, emit) {
+	if (Array.isArray(value)) {
+		for (let index = 0; index < value.length; index++) emitDeep(value[index], emit);
+		return;
+	}
+	emit(value);
+}
+//#endregion
+export { flatMapDeep };