Update Backend api call functions

[sailingsam]

Issue Description

right now in some files I am directly calling API with fetch functions (use search feature in vs code for finding all those calls)

for eg. in SignupForm.jsx i have written a method

const response = await fetch(
        `${import.meta.env.VITE_BASE_URL_BACKEND}/api/users/register/otp/verify_otp`,
        {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
          },
          body: JSON.stringify({ email, otp: otpentered }),
        }
      );

which is not good practice to call API requests,

Expected Behavior

Convert those all fetch requests to proper method using Axios instead of fetch methods and place them inside BackendCalls folder.

for Reference: see files inside backendCalls/auth folder

Additional Information

If yu have doubt please ask and then only work.