feat: automate Slack app creation and installation

Create customer-owned Slack apps from a temporary configuration token, bind installation to saved OAuth state, and resume safely through the existing wizard.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/shared/src/validators/chat-channels.ts

@@ -86,6 +86,7 @@ export const updateChatEndpointSchema = z
   .object({
     communicationInstructions: multilineTextSchema.pipe(z.string().trim().max(4000)).optional(),
     slackApp: slackAppConfigurationSchema.optional(),
+    slackSetupMethod: z.enum(["automatic", "manual"]).optional(),
     allowDirectMessages: z.boolean().optional(),
     allowGroupChats: z.boolean().optional(),
     allowUnlinkedPeople: z.boolean().optional(),