fix: allow origin colors to be edited and display correctly in dashboard

- Fixed database initialization where default origins were seeded without color_classes.

- Added a visual color picker to the Origens admin page to allow users to assign colors to origin tags.

- Updated Dashboard Pie Chart to read the color classes correctly and display them.

types.ts

@@ -27,6 +27,7 @@ export interface OriginItemDef {
   id: string;
   origin_group_id: string;
   name: string;
+  color_class: string;
 }
 
 export interface OriginGroupDef {