feat: add Discord webhook configuration support to forms and create dedicated admin settings page

db/schema.ts

@@ -72,6 +72,9 @@ export const forms = pgTable("form", {
   description: text("description"),
   createdAt: timestamp("created_at", { mode: "date" }).defaultNow().notNull(),
   isOpen: boolean("is_open").notNull().default(true),
+  discordWebhookUrl: text("discord_webhook_url"),
+  discordWebhookTemplate: text("discord_webhook_template"),
+  discordWebhookUpdateTemplate: text("discord_webhook_update_template"),
 });
 
 export type QuestionType = "text" | "textarea" | "radio" | "checkbox";