Admin Page: Input for setting max project count

[rahulrangers]

• Add an input field on the admin page where the admin can set the maximum number of projects a student can apply for.
• Fetch the current value from the backend on page load.
• Update the value via a PUT request when the form is submitted.
• For the backend routes (GET and PUT) that handle this, please refer to the related issue in the backend repository: Backend Issue Link. You can check the progress or coordinate if needed.