Add TCP/UDP port mapping support

- Add app_ports table for storing port mappings per app
- Add Port model with CRUD operations
- Add handlers for adding/deleting port mappings
- Add ports section to app detail template
- Update Docker client to configure port bindings when creating containers
- Support both TCP and UDP protocols

templates/app_detail.html

@@ -213,6 +213,58 @@
         </form>
     </div>
 
+    <!-- Ports -->
+    <div class="card p-6 mb-6">
+        <h2 class="section-title mb-4">Port Mappings</h2>
+        {{if .Ports}}
+        <div class="overflow-x-auto mb-4">
+            <table class="table">
+                <thead class="table-header">
+                    <tr>
+                        <th>Host Port</th>
+                        <th>Container Port</th>
+                        <th>Protocol</th>
+                        <th class="text-right">Actions</th>
+                    </tr>
+                </thead>
+                <tbody class="table-body">
+                    {{range .Ports}}
+                    <tr>
+                        <td class="font-mono">{{.HostPort}}</td>
+                        <td class="font-mono">{{.ContainerPort}}</td>
+                        <td>
+                            {{if eq .Protocol "udp"}}
+                            <span class="badge-warning">UDP</span>
+                            {{else}}
+                            <span class="badge-info">TCP</span>
+                            {{end}}
+                        </td>
+                        <td class="text-right">
+                            <form method="POST" action="/apps/{{$.App.ID}}/ports/{{.ID}}/delete" class="inline" data-confirm="Delete this port mapping?">
+                                <button type="submit" class="text-error-500 hover:text-error-700 text-sm">Delete</button>
+                            </form>
+                        </td>
+                    </tr>
+                    {{end}}
+                </tbody>
+            </table>
+        </div>
+        {{end}}
+        <form method="POST" action="/apps/{{.App.ID}}/ports" class="flex flex-col sm:flex-row gap-2 items-end">
+            <div class="flex-1 w-full">
+                <input type="number" name="host_port" placeholder="Host port" required min="1" max="65535" class="input font-mono text-sm">
+            </div>
+            <div class="flex-1 w-full">
+                <input type="number" name="container_port" placeholder="Container port" required min="1" max="65535" class="input font-mono text-sm">
+            </div>
+            <select name="protocol" class="input text-sm">
+                <option value="tcp">TCP</option>
+                <option value="udp">UDP</option>
+            </select>
+            <button type="submit" class="btn-primary">Add</button>
+        </form>
+    </div>
+
     <!-- Recent Deployments -->
     <div class="card p-6 mb-6">
         <div class="flex items-center justify-between mb-4">