Add instructions management functionality and update related components

- Introduced new endpoints for managing instruction intros and tabs, allowing admins to create, update, and delete instructional content.
- Enhanced the FactoryResetCommandHandler to include the seeding of instruction data during a factory reset.
- Updated the database schema to include InstructionIntro and InstructionTab entities, with corresponding migrations.
- Improved frontend routing and components to support the new instructions section, including a dedicated page for displaying instructions and tabs.
- Enhanced API documentation to reflect the new instruction management features and their expected request/response formats.
- Added localization support for the new instructions functionality in both Russian and English.

frontend/src/shared/api/types.ts

@@ -117,6 +117,22 @@ export type NewsPostDto = {
   updatedAt: string | null
 }
 
+export type InstructionIntroDto = {
+  id: string
+  body: string
+  updatedAt: string
+}
+
+/** Один DTO на пользовательскую страницу и админку — у вкладки нет полей, скрытых от юзера. */
+export type InstructionTabDto = {
+  id: string
+  title: string
+  body: string
+  sortOrder: number
+  createdAt: string
+  updatedAt: string | null
+}
+
 export type LinkTokenResponse = {
   deepLink: string | null
   expiresAt: string