Added API Constants for Staff

frontend/src/APIClients/Mutations/StaffMutations.ts

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+import {gql} from "@apollo/client";
+
+export const ADD_STAFF = gql`
+mutation AddStaff($staff: CreateStaffDTO!) {
+    addStaff(staff: $staff) {
+        userId
+        email
+        phoneNumber
+        firstName
+        lastName
+        displayName
+        profilePictureURL
+        isActive
+        isAdmin
+    }
+}
+`
+;
+
+export const UPDATE_STAFF = gql`
+  mutation UpdateStaff($userId: userID!, $staff: UpdateStaffDTO!) {
+    updateStaff(userId: $userId, staff: $staff) {
+      userId
+      email
+      phoneNumber
+      firstName
+      lastName
+      displayName
+      profilePictureURL
+      isActive
+      isAdmin
+    }
+  }
+`;
+
+export const DELETE_STAFF = gql`
+  mutation DeleteStaff($userId: ID!) {
+    deleteStaff(userId: $userId) {
+      userId
+      email
+      phoneNumber
+      firstName
+      lastName
+      displayName
+      profilePictureURL
+      isActive
+      isAdmin
+    }
+  }
+`;
+

frontend/src/APIClients/Queries/StaffQueries.ts

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+import {gql} from "@apollo/client";
+
+export const GET_ALL_STAFF = gql`
+  query GetAllStaff {
+    getAllStaff {
+      userId
+      email
+      phoneNumber
+      firstName
+      lastName
+      displayName
+      profilePictureURL
+      isActive
+      isAdmin
+    }
+  }
+`;
+
+export const GET_STAFF_BY_IDS = gql`
+  query GetStaffByIds {
+    getStaffByIds {
+      userId
+      email
+      phoneNumber
+      firstName
+      lastName
+      displayName
+      profilePictureURL
+      isActive
+      isAdmin
+    }
+  }
+`;

frontend/src/APIClients/Types/StaffTypes.ts

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+export type UserRequest = {
+    userId?: string;
+    email: string;
+    password: string;
+    phoneNumber?: string;
+    firstName: string;
+    lastName: string;
+    isAdmin: boolean;
+    displayName?: string;
+    profilePictureURL?: string;
+    isActive: boolean;
+  };
+
+export type UserRequestID = {
+    userId: string;
+    email: string;
+    password: string;
+    phoneNumber?: string;
+    firstName: string;
+    lastName: string;
+    isAdmin: boolean;
+    displayName?: string;
+    profilePictureURL?: string;
+    isActive: boolean;
+  };
+
+  export type UserRequestAdd = {
+    userId?: number;
+    email: string;
+    phoneNumber: string;
+    firstName: string;
+    lastName: string;
+    displayName: string;
+    profilePictureURL?: string;
+    isActive: boolean;
+    isAdmin: boolean;
+};
+
+export type UserRequestUpdate = {
+      userId: number;
+      email?: string;
+      phoneNumber?: string;
+      firstName?: string;
+      lastName?: string;
+      displayName?: string;
+      profilePictureURL?: string;
+      isActive?: boolean;
+      isAdmin?: boolean;
+  };
+
+  export type UserRequestDelete = {
+    userId: number;
+    email?: string;
+    phoneNumber?: string;
+    firstName?: string;
+    lastName?: string;
+    displayName?: string;
+    profilePictureURL?: string;
+    isActive?: boolean;
+    isAdmin?: boolean;
+};