Make categories global (#1160)

* Make categories global

This solves us A LOT of cash flow and budgeting problems.

* Update schema.rb

* Update auto_categorizer.rb

* Update income_statement.rb

* FIX budget sub-categories

* FIX sub-categories and tests

* Add 2 step migration

app/views/api/v1/categories/_category.json.jbuilder

@@ -2,7 +2,6 @@
 
 json.id category.id
 json.name category.name
-json.classification category.classification
 json.color category.color
 json.icon category.lucide_icon
 

app/views/api/v1/transactions/_transaction.json.jbuilder

@@ -31,7 +31,6 @@ if transaction.category.present?
   json.category do
     json.id transaction.category.id
     json.name transaction.category.name
-    json.classification transaction.category.classification
     json.color transaction.category.color
     json.icon transaction.category.lucide_icon
   end