refactor: use ajv instead of cafy (#8324)

* wip

* wip

* Update abuse-user-reports.ts

* Update files.ts

* Update list-remote.ts

* Update list.ts

* Update show-users.ts

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* Update search.ts

* Update reactions.ts

* Update search.ts

* wip

* wip

* wip

* wip

* Update update.ts

* Update relation.ts

* Update available.ts

* wip

* wip

* wip

* Update packages/backend/src/server/api/define.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

* Update define.ts

* Update define.ts

* typo

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* wip

* Update signup.ts

* Update call.ts

* minimum for limit

* type

* remove needless annotation

* wip

* Update signup.ts

* wip

* wip

* fix

* Update create.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

packages/backend/src/server/api/endpoints/notifications/create.ts

@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../define';
 import { createNotification } from '@/services/create-notification';
 
@@ -9,26 +8,22 @@ export const meta = {
 
 	kind: 'write:notifications',
 
-	params: {
-		body: {
-			validator: $.str,
-		},
-
-		header: {
-			validator: $.optional.nullable.str,
-		},
-
-		icon: {
-			validator: $.optional.nullable.str,
-		},
-	},
-
 	errors: {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		body: { type: 'string' },
+		header: { type: 'string', nullable: true },
+		icon: { type: 'string', nullable: true },
+	},
+	required: ['body'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user, token) => {
+export default define(meta, paramDef, async (ps, user, token) => {
 	createNotification(user.id, 'app', {
 		appAccessTokenId: token ? token.id : null,
 		customBody: ps.body,