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/math/medianBy.js

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+const require_median = require("./median.js");
+//#region src/math/medianBy.ts
+/**
+* Calculates the median of an array of elements when applying
+* the `getValue` function to each element.
+*
+* The median is the middle value of a sorted array.
+* If the array has an odd number of elements, the median is the middle value.
+* If the array has an even number of elements, it returns the average of the two middle values.
+*
+* If the array is empty, this function returns `NaN`.
+*
+* @template T - The type of elements in the array.
+* @param items An array to calculate the median.
+* @param getValue A function that selects a numeric value from each element.
+* @returns The median of all the numbers as determined by the `getValue` function.
+*
+* @example
+* medianBy([{ a: 1 }, { a: 2 }, { a: 3 }, { a: 4 }, { a: 5 }], x => x.a); // Returns: 3
+* medianBy([{ a: 1 }, { a: 2 }, { a: 3 }, { a: 4 }], x => x.a); // Returns: 2.5
+* medianBy([], x => x.a); // Returns: NaN
+*/
+function medianBy(items, getValue) {
+	const nums = items.map((x) => getValue(x));
+	return require_median.median(nums);
+}
+//#endregion
+exports.medianBy = medianBy;