Add LndHub db/models, and quick stats for admin views

app/views/admin/lightning/index.html.erb

@@ -0,0 +1,48 @@
+<%= render HeaderComponent.new(title: "Lightning Network") %>
+
+<%= render MainSimpleComponent.new do %>
+  <section>
+    <%= render QuickstatsContainerComponent.new do %>
+      <%= render QuickstatsItemComponent.new(
+          type: :number,
+          title: 'Current user balance',
+          value: @ln[:current_balance],
+          unit: 'sats'
+      ) %>
+      <%= render QuickstatsItemComponent.new(
+          type: :number,
+          title: 'Users with sats',
+          value: @ln[:users_with_sats],
+          meta: "/ #{User.count}"
+      ) %>
+    <% end %>
+  </section>
+
+  <section>
+    <h3>Accounts</h3>
+    <table>
+      <thead>
+        <tr>
+          <th>LN Account</th>
+          <th>User</th>
+          <th>Balance</th>
+        </tr>
+      </thead>
+      <tbody>
+        <% @accounts.each do |account| %>
+          <tr>
+            <td class="font-mono">
+              <%= account.login[0, 8] %>...<%= account.login[12, 19] %>
+            </td>
+            <td>
+              <% if user = @users.find{ |u| u[2] == account.login } %>
+                <%= "#{user[0]}@#{user[1]}" %>
+              <% end %>
+            </td>
+            <td><%= number_with_delimiter account.balance.to_i.to_s %></td>
+          </tr>
+        <% end %>
+      </tbody>
+    </table>
+  </section>
+<% end %>