feat: add minimal frontend (accounts, trial balance)

frontend/js/accounts.js

@@ -0,0 +1,18 @@
+(async () => {
+  try {
+    const data = await apiGet("/accounts/");
+    const tbody = document.getElementById("accounts-body");
+
+    data.forEach((a) => {
+      const tr = document.createElement("tr");
+      tr.innerHTML = `
+        <td>${a.account_code}</td>
+        <td>${a.account_name}</td>
+        <td>${a.account_type}</td>
+      `;
+      tbody.appendChild(tr);
+    });
+  } catch (e) {
+    alert(e.message);
+  }
+})();