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/dashboard.html

@@ -4,9 +4,9 @@
 <h1>Dashboard</h1>
 
 <div class="quick-actions">
-  <a href="#" aria-disabled="true" class="btn-action">New Printer</a>
-  <a href="#" aria-disabled="true" class="btn-action">Upload Driver</a>
-  <a href="#" aria-disabled="true" class="btn-action">Export Package</a>
+  <a href="/printers" class="btn-action">New Printer</a>
+  <a href="/drivers" class="btn-action">Upload Driver</a>
+  <a href="/packages" class="btn-action">Export Package</a>
 </div>
 
 <section class="recent-activity">
@@ -17,7 +17,7 @@
     {% if recent_printers %}
       <ul>
         {% for printer in recent_printers %}
-          <li>{{ printer.name }} — {{ printer.ip_address }}</li>
+          <li><a href="/printers/{{ printer.id }}">{{ printer.name }}</a> — {{ printer.ip_address }}</li>
         {% endfor %}
       </ul>
     {% else %}
@@ -30,7 +30,7 @@
     {% if recent_packages %}
       <ul>
         {% for package in recent_packages %}
-          <li>{{ package }}</li>
+          <li><a href="/printers/{{ package.id }}">{{ package.name }}</a>{% if package.client_id %} — {{ package.client.name }}{% endif %}</li>
         {% endfor %}
       </ul>
     {% else %}