Structural cleanup

- Rename src/store/ -> src/context/ (store implies Redux, this is React Context)
- Rename services/api.jsx -> api.js (file contains no JSX)
- Delete unused Vite boilerplate: src/assets/, App.css
- Update all imports accordingly

src/components/CardRow/CardRow.jsx

@@ -1,5 +1,5 @@
 import React, { useContext } from 'react';
-import { CardContext } from '../../store/CardContext';
+import { CardContext } from '../../context/CardContext';
 import PrintingRow from '../PrintingRow/PrintingRow';
 
 const BADGE = {

src/components/PrintingRow/PrintingRow.jsx

@@ -1,5 +1,5 @@
 import React, { useContext, useState } from 'react';
-import { CardContext } from '../../store/CardContext';
+import { CardContext } from '../../context/CardContext';
 import { updateCardAmount } from '../../services/api';
 
 function PrintingRow({ card_id, printing, cols, zebra }) {