[feature] Admin accounts endpoints; approve/reject sign-ups (#2826)

* update settings panels, add pending overview + approve/deny functions

* add admin accounts get, approve, reject

* send approved/rejected emails

* use signup URL

* docs!

* email

* swagger

* web linting

* fix email tests

* wee lil fixerinos

* use new paging logic for GetAccounts() series of admin endpoints, small changes to query building

* shuffle useAccountIDIn check *before* adding to query

* fix parse from toot react error

* use `netip.Addr`

* put valid slices in globals

* optimistic updates for account state

---------

Co-authored-by: kim <grufwub@gmail.com>

internal/db/user.go

@@ -54,4 +54,10 @@ type User interface {
 
 	// DeleteUserByID deletes one user by its ID.
 	DeleteUserByID(ctx context.Context, userID string) error
+
+	// PutDeniedUser inserts the given deniedUser into the db.
+	PutDeniedUser(ctx context.Context, deniedUser *gtsmodel.DeniedUser) error
+
+	// GetDeniedUserByID returns one denied user with the given ID.
+	GetDeniedUserByID(ctx context.Context, id string) (*gtsmodel.DeniedUser, error)
 }