feat(api-docs): add error responses to API documentation

backend/src/server/routes/v1/integration-router.ts

@@ -11,6 +11,8 @@ import { AuthMode } from "@app/services/auth/auth-type";
 import { IntegrationMetadataSchema } from "@app/services/integration/integration-schema";
 import { PostHogEventTypes, TIntegrationCreatedEvent } from "@app/services/telemetry/telemetry-types";
 
+import { DefaultResponseErrorsSchema } from "../sanitizedSchemas";
+
 export const registerIntegrationRouter = async (server: FastifyZodProvider) => {
   server.route({
     method: "POST",
@@ -49,6 +51,7 @@ export const registerIntegrationRouter = async (server: FastifyZodProvider) => {
         metadata: IntegrationMetadataSchema.default({})
       }),
       response: {
+        ...DefaultResponseErrorsSchema,
         200: z.object({
           integration: IntegrationsSchema
         })
@@ -135,6 +138,7 @@ export const registerIntegrationRouter = async (server: FastifyZodProvider) => {
         metadata: IntegrationMetadataSchema.optional()
       }),
       response: {
+        ...DefaultResponseErrorsSchema,
         200: z.object({
           integration: IntegrationsSchema
         })
@@ -219,6 +223,7 @@ export const registerIntegrationRouter = async (server: FastifyZodProvider) => {
           .transform((val) => val === "true")
       }),
       response: {
+        ...DefaultResponseErrorsSchema,
         200: z.object({
           integration: IntegrationsSchema
         })