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/round.d.mts

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+//#region src/math/round.d.ts
+/**
+ * Rounds a number to a specified precision.
+ *
+ * This function takes a number and an optional precision value, and returns the number rounded
+ * to the specified number of decimal places.
+ *
+ * @param value - The number to round.
+ * @param [precision=0] - The number of decimal places to round to. Defaults to 0.
+ * @returns The rounded number.
+ * @throws {Error} Throws an error if `Precision` is not integer.
+ *
+ * @example
+ * const result1 = round(1.2345); // result1 will be 1
+ * const result2 = round(1.2345, 2); // result2 will be 1.23
+ * const result3 = round(1.2345, 3); // result3 will be 1.235
+ * const result4 = round(1.2345, 3.1); // This will throw an error
+ */
+declare function round(value: number, precision?: number): number;
+//#endregion
+export { round };