feat: добавил эндпоинт для получения статистики админского дашборда

backend/UniVerse.Api/Controllers/UsersController.cs

@@ -159,6 +159,19 @@ public class UsersController : ControllerBase
     [ProducesResponseType(StatusCodes.Status404NotFound)]
     public async Task<ActionResult<UserStatsDto>> Stats(int id) => Ok(await _users.GetStatsAsync(id));
 
+    /// <summary>Получить статистику для админского дашборда.</summary>
+    /// <remarks>Только Admin.</remarks>
+    /// <response code="200">Агрегированная статистика дашборда.</response>
+    /// <response code="401">Требуется аутентификация.</response>
+    /// <response code="403">Требуется роль Admin.</response>
+    [Authorize(Roles = "Admin")]
+    [HttpGet("admin/stats")]
+    [ProducesResponseType(typeof(AdminDashboardStatsDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<ActionResult<AdminDashboardStatsDto>> AdminStats() =>
+        Ok(await _users.GetAdminDashboardStatsAsync());
+
     /// <summary>Получить список записей пользователя на лекции.</summary>
     /// <remarks>Только Admin. Для текущего пользователя используйте GET /api/v1/users/me/enrollments.</remarks>
     /// <param name="id">ID пользователя.</param>

backend/UniVerse.Api/openapi.json

@@ -4158,6 +4158,52 @@
         ]
       }
     },
+    "/api/v1/users/admin/stats": {
+      "get": {
+        "tags": [
+          "Users"
+        ],
+        "summary": "Получить статистику для админского дашборда.",
+        "description": "Только Admin.\n\n**Required roles:** Admin",
+        "responses": {
+          "200": {
+            "description": "Агрегированная статистика дашборда.",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/AdminDashboardStatsDto"
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Требуется аутентификация.",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ProblemDetails"
+                }
+              }
+            }
+          },
+          "403": {
+            "description": "Требуется роль Admin.",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ProblemDetails"
+                }
+              }
+            }
+          }
+        },
+        "security": [
+          {
+            "Bearer": [ ]
+          }
+        ]
+      }
+    },
     "/api/v1/users/{id}/enrollments": {
       "get": {
         "tags": [
@@ -4758,6 +4804,28 @@
         },
         "additionalProperties": false
       },
+      "AdminDashboardStatsDto": {
+        "type": "object",
+        "properties": {
+          "usersCount": {
+            "type": "integer",
+            "format": "int32"
+          },
+          "lecturesCount": {
+            "type": "integer",
+            "format": "int32"
+          },
+          "enrollmentsCount": {
+            "type": "integer",
+            "format": "int32"
+          },
+          "pendingReviewsCount": {
+            "type": "integer",
+            "format": "int32"
+          }
+        },
+        "additionalProperties": false
+      },
       "AuthResponse": {
         "type": "object",
         "properties": {

backend/UniVerse.Application/DTOs/Users/UserDtos.cs

@@ -42,6 +42,13 @@ public record UserStatsDto(
     IReadOnlyList<EnrollmentSlotRuleDto> EnrollmentSlotRules
 );
 
+public record AdminDashboardStatsDto(
+    int UsersCount,
+    int LecturesCount,
+    int EnrollmentsCount,
+    int PendingReviewsCount
+);
+
 public record EnrollmentSlotRuleDto(int Level, int Slots);
 
 public record UpdateUserRequest(

backend/UniVerse.Application/Interfaces/IUserService.cs

@@ -10,6 +10,7 @@ public interface IUserService
     Task<UserDto> GetByIdAsync(int id);
     Task<UserDto> UpdateProfileAsync(int id, UpdateUserRequest request);
     Task<UserStatsDto> GetStatsAsync(int id);
+    Task<AdminDashboardStatsDto> GetAdminDashboardStatsAsync();
     Task<PagedResult<LectureDto>> GetEnrollmentsAsync(int id, PaginationRequest pagination);
     Task<PagedResult<UserDto>> GetAllAsync(UserFilterRequest filter);
     Task SetRolesAsync(int id, IReadOnlyCollection<UserRole> roles);

backend/UniVerse.Infrastructure/Services/UserService.cs

@@ -74,6 +74,17 @@ public class UserService : IUserService
         );
     }
 
+    public async Task<AdminDashboardStatsDto> GetAdminDashboardStatsAsync()
+    {
+        var usersCount = await _db.Users
+            .CountAsync(user => !user.Roles.Any(role => role.Role == UserRole.Teacher));
+        var lecturesCount = await _db.Lectures.CountAsync();
+        var enrollmentsCount = await _db.LectureEnrollments.CountAsync();
+        var pendingReviewsCount = await _db.Reviews.CountAsync(review => review.LlmStatus == ReviewLlmStatus.Pending);
+
+        return new AdminDashboardStatsDto(usersCount, lecturesCount, enrollmentsCount, pendingReviewsCount);
+    }
+
     public async Task<PagedResult<LectureDto>> GetEnrollmentsAsync(int id, PaginationRequest pagination)
     {
         if (!await _db.Users.AnyAsync(u => u.Id == id))