feat(admin,api): restrict community creation on self-hosted (#3055)

packages/schema/src/domains/admin/AdminSchemas.ts

@@ -547,6 +547,7 @@ const InstancePolicyResponse = z.object({
 	single_community_guild_id: z.string().nullable(),
 	direct_messages_disabled: z.boolean(),
 	direct_messages_locked: z.boolean(),
+	guild_create_access: z.boolean(),
 	premium_mode: z.enum(['mirror', 'everyone']),
 	services: z.object({
 		gif_enabled: z.boolean().nullable(),
@@ -656,6 +657,7 @@ const InstancePolicyUpdateSchema = z.object({
 	direct_messages_disabled: z.boolean().optional(),
 	direct_messages_locked: z.literal(false).optional(),
 	premium_mode: z.enum(['mirror', 'everyone']).optional(),
+	guild_create_access: z.boolean().optional(),
 	services: z
 		.object({
 			gif_enabled: z.boolean().nullish(),

packages/schema/src/domains/instance/InstanceSchemas.ts

@@ -160,6 +160,11 @@ export const InstanceCommunitySchema = z
 		direct_messages_disabled: z
 			.boolean()
 			.describe('Whether direct messages and friend requests are disabled instance-wide'),
+		guild_create_access: z
+			.boolean()
+			.describe(
+				'Whether every account can create communities. When false, only admins and accounts granted the feature_guild_create limit can',
+			),
 	})
 	.describe('Community topology and direct-message policy for this instance');
 export type InstanceCommunity = z.infer<typeof InstanceCommunitySchema>;