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/set/keyBy.mjs

@@ -0,0 +1,38 @@
+//#region src/set/keyBy.ts
+/**
+* Maps each element of a Set based on a provided key-generating function.
+*
+* This function takes a Set and a function that generates a key from each value.
+* It returns a new Map where the keys are generated by the key function and the values are
+* the corresponding values from the original set. If multiple elements produce the same key,
+* the last value encountered will be used.
+*
+* @template T - The type of elements in the Set.
+* @template K - The type of keys to produce in the returned Map.
+* @param set - The set of elements to be mapped.
+* @param getKeyFromValue - A function that generates a key from a value.
+* @returns A Map where the generated keys are mapped to each element's value.
+*
+* @example
+* const set = new Set([
+*   { type: 'fruit', name: 'apple' },
+*   { type: 'fruit', name: 'banana' },
+*   { type: 'vegetable', name: 'carrot' }
+* ]);
+* const result = keyBy(set, item => item.type);
+* // result will be:
+* // Map(2) {
+* //   'fruit' => { type: 'fruit', name: 'banana' },
+* //   'vegetable' => { type: 'vegetable', name: 'carrot' }
+* // }
+*/
+function keyBy(set, getKeyFromValue) {
+	const result = /* @__PURE__ */ new Map();
+	for (const value of set) {
+		const newKey = getKeyFromValue(value, value, set);
+		result.set(newKey, value);
+	}
+	return result;
+}
+//#endregion
+export { keyBy };