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/_internal/isUnsafeProperty.js

@@ -0,0 +1,16 @@
+//#region src/_internal/isUnsafeProperty.ts
+/**
+* Checks if a property key is unsafe to modify directly.
+*
+* This function is used in functions like `merge` to prevent prototype pollution attacks
+* by identifying property keys that could modify the object's prototype chain or constructor.
+*
+* @param key - The property key to check
+* @returns `true` if the property is unsafe to modify directly, `false` otherwise
+* @internal
+*/
+function isUnsafeProperty(key) {
+	return key === "__proto__";
+}
+//#endregion
+exports.isUnsafeProperty = isUnsafeProperty;