gateway: add cron finished-run webhook (#14535)

* gateway: add cron finished webhook delivery

* config: allow cron webhook in runtime schema

* cron: require notify flag for webhook posts

* ui/docs: add cron notify toggle and webhook docs

* fix: harden cron webhook auth and fill notify coverage (#14535) (thanks @advaitpaliwal)

---------

Co-authored-by: Tyler Yust <TYTYYUST@YAHOO.COM>

src/config/zod-schema.ts

@@ -93,6 +93,14 @@ const MemorySchema = z
   .strict()
   .optional();
 
+const HttpUrlSchema = z
+  .string()
+  .url()
+  .refine((value) => {
+    const protocol = new URL(value).protocol;
+    return protocol === "http:" || protocol === "https:";
+  }, "Expected http:// or https:// URL");
+
 export const OpenClawSchema = z
   .object({
     $schema: z.string().optional(),
@@ -295,6 +303,8 @@ export const OpenClawSchema = z
         enabled: z.boolean().optional(),
         store: z.string().optional(),
         maxConcurrentRuns: z.number().int().positive().optional(),
+        webhook: HttpUrlSchema.optional(),
+        webhookToken: z.string().optional().register(sensitive),
         sessionRetention: z.union([z.string(), z.literal(false)]).optional(),
       })
       .strict()