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/compat/string/startsWith.js

@@ -0,0 +1,25 @@
+//#region src/compat/string/startsWith.ts
+/**
+* Checks if a string contains another string at the beginning of the string.
+*
+* Checks if one string startsWith another string. Optional position parameter to start searching from a certain index.
+*
+* @param str - The string that might contain the target string.
+* @param target - The string to search for.
+* @param position - An optional offset to start searching in the str string
+* @returns True if the str string starts with the target string.
+*
+* @example
+* const isPrefix = startsWith('fooBar', 'foo') // returns true
+* const isPrefix = startsWith('fooBar', 'bar') // returns false
+* const isPrefix = startsWith('fooBar', 'abc') // returns false
+* const isPrefix = startsWith('fooBar', 'Bar', 2) // returns true
+* const isPrefix = startsWith('fooBar', 'Bar', 5) // returns false
+*/
+function startsWith(str, target, position) {
+	if (str == null || target == null) return false;
+	if (position == null) position = 0;
+	return str.startsWith(target, position);
+}
+//#endregion
+exports.startsWith = startsWith;