Integrate Total Applications, Pending Review, Rejected, Approved - numbers with backend

[SamNie2027]

Motivation
Now that we have backend routes, we can use real numbers for this visual

Acceptance Criteria

Backend

• Create an endpoint to get the number of total applications - make it efficient by using count instead of returning entire objects.
• Create an endpoint to get the number of total applications under the status "In Review"
• Create an endpoint to get the number of total applications under the status "Rejected"
• Create an endpoint to get the number of total applications under the status "Accepted" or "Active"

Frontend

• Create four hooks in apiClient.ts that call your respective endpoints you created
• Where the four tiles in the image are situated in the frontend, instead of using the hardcoded numbers replace it with the numbers returned from the hooks.

Remember to test end 2 end and add unit tests as usual.