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.

backend/src/PnvPanel.Infrastructure/Persistence/AppDbContext.cs

@@ -6,6 +6,7 @@ using PnvPanel.Domain.Apps;
 using PnvPanel.Domain.Audit;
 using PnvPanel.Domain.Configs;
 using PnvPanel.Domain.Inbounds;
+using PnvPanel.Domain.Instructions;
 using PnvPanel.Domain.News;
 using PnvPanel.Domain.Nodes;
 using PnvPanel.Domain.Support;
@@ -50,6 +51,10 @@ public class AppDbContext(DbContextOptions<AppDbContext> options)
 
     public DbSet<TicketAttachment> TicketAttachments => Set<TicketAttachment>();
 
+    public DbSet<InstructionIntro> InstructionIntros => Set<InstructionIntro>();
+
+    public DbSet<InstructionTab> InstructionTabs => Set<InstructionTab>();
+
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         base.OnModelCreating(modelBuilder);