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/toSnakeCaseKeys.d.mts

@@ -0,0 +1,53 @@
+//#region src/object/toSnakeCaseKeys.d.ts
+type SnakeCase<S extends string> = S extends Uppercase<S> ? Lowercase<S> : S extends `${infer P1}${infer P2}` ? P2 extends Uncapitalize<P2> ? `${Lowercase<P1>}${SnakeCase<P2>}` : `${Lowercase<P1>}_${SnakeCase<Uncapitalize<P2>>}` : Lowercase<S>;
+type NonPlainObject = Date | RegExp | Map<any, any> | Set<any> | WeakMap<any, any> | WeakSet<any> | Promise<any> | Error | ArrayBuffer | DataView | Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array | BigInt64Array | BigUint64Array | ((...args: any[]) => any) | typeof globalThis;
+type ToSnakeCaseKeys<T> = T extends NonPlainObject ? T : T extends any[] ? Array<ToSnakeCaseKeys<T[number]>> : T extends Record<string, any> ? { [K in keyof T as SnakeCase<string & K>]: ToSnakeCaseKeys<T[K]> } : T;
+/**
+ * Creates a new object composed of the properties with keys converted to snake_case.
+ *
+ * This function takes an object and returns a new object that includes the same properties,
+ * but with all keys converted to snake_case format.
+ *
+ * @template T - The type of object.
+ * @param obj - The object to convert keys from.
+ * @returns A new object with all keys converted to snake_case.
+ *
+ * @example
+ * // Example with objects
+ * const obj = { userId: 1, firstName: 'John' };
+ * const result = toSnakeCaseKeys(obj);
+ * // result will be { user_id: 1, first_name: 'John' }
+ *
+ * // Example with arrays of objects
+ * const arr = [
+ *   { userId: 1, firstName: 'John' },
+ *   { userId: 2, firstName: 'Jane' }
+ * ];
+ * const arrResult = toSnakeCaseKeys(arr);
+ * // arrResult will be [{ user_id: 1, first_name: 'John' }, { user_id: 2, first_name: 'Jane' }]
+ *
+ * // Example with nested objects
+ * const nested = {
+ *   userData: {
+ *     userId: 1,
+ *     userAddress: {
+ *       streetName: 'Main St',
+ *       zipCode: '12345'
+ *     }
+ *   }
+ * };
+ * const nestedResult = toSnakeCaseKeys(nested);
+ * // nestedResult will be:
+ * // {
+ * //   user_data: {
+ * //     user_id: 1,
+ * //     user_address: {
+ * //       street_name: 'Main St',
+ * //       zip_code: '12345'
+ * //     }
+ * //   }
+ * // }
+ */
+declare function toSnakeCaseKeys<T>(obj: T): ToSnakeCaseKeys<T>;
+//#endregion
+export { toSnakeCaseKeys };