fix: login info lost for mining

[PanchoBubble]

• Moves start/stop mining to its own file
• Removes client side persist of airdrop user token and saves it on the be side
• Adds restart mm proxy logic on the be side when user tokens are updated

[brianp]

During testing its noted my airdrop was logged out again when running this branch. Is there an expectation of persisting existing logins or should it have been invalidated?

Logins between restarts on this branch seem fine. Logins from any other branches are fine on those branches.
Logins from other branches aren't carried over to this branch.