feat(07-01): wire dashboard data and add /packages listing page

- Dashboard queries 5 most recent Printer records and 5 most recent driver-assigned ones
- New /packages route lists printers with drivers, with intunewin/ninja download links
- packages.html template extends base.html with Pico grid table
- Dashboard printer/package items now link to detail pages
- Quick action buttons wired to real routes (removed aria-disabled)

imptune/templates/packages.html

@@ -0,0 +1,37 @@
+{% extends "base.html" %}
+
+{% block content %}
+<h1>Packages</h1>
+<p>Printers with drivers assigned — ready for deployment package export.</p>
+
+{% if printers %}
+  <figure>
+    <table role="grid">
+      <thead>
+        <tr>
+          <th scope="col">Printer</th>
+          <th scope="col">Client</th>
+          <th scope="col">Driver</th>
+          <th scope="col">Downloads</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for printer in printers %}
+          <tr>
+            <td><a href="/printers/{{ printer.id }}">{{ printer.name }}</a></td>
+            <td>{% if printer.client_id %}{{ printer.client.name }}{% else %}—{% endif %}</td>
+            <td>{{ printer.driver.original_filename }}</td>
+            <td>
+              <a href="/printers/{{ printer.id }}/packages/intunewin">.intunewin</a>
+              &nbsp;|&nbsp;
+              <a href="/printers/{{ printer.id }}/packages/ninja">NinjaRMM ZIP</a>
+            </td>
+          </tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </figure>
+{% else %}
+  <p class="empty-state">No package-ready printers yet. Assign a driver to a printer to enable package export.</p>
+{% endif %}
+{% endblock %}