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/object/pickBy.mjs

@@ -0,0 +1,32 @@
+//#region src/object/pickBy.ts
+/**
+* Creates a new object composed of the properties that satisfy the predicate function.
+*
+* This function takes an object and a predicate function, and returns a new object that
+* includes only the properties for which the predicate function returns true.
+*
+* @template T - The type of object.
+* @param obj - The object to pick properties from.
+* @param shouldPick - A predicate function that determines
+* whether a property should be picked. It takes the property's key and value as arguments and returns `true`
+* if the property should be picked, and `false` otherwise.
+* @returns A new object with the properties that satisfy the predicate function.
+*
+* @example
+* const obj = { a: 1, b: 'pick', c: 3 };
+* const shouldPick = (value) => typeof value === 'string';
+* const result = pickBy(obj, shouldPick);
+* // result will be { b: 'pick' }
+*/
+function pickBy(obj, shouldPick) {
+	const result = {};
+	const keys = Object.keys(obj);
+	for (let i = 0; i < keys.length; i++) {
+		const key = keys[i];
+		const value = obj[key];
+		if (shouldPick(value, key)) result[key] = value;
+	}
+	return result;
+}
+//#endregion
+export { pickBy };