Add container restart capability from admin UI

- Added POST /api/admin/restart endpoint using Docker socket
- Mounts Docker socket read-only in docker-compose.yml
- Admin UI now has working 'Restart Container' button
- Auto-reloads page after container comes back up
- Falls back to manual restart instructions if socket unavailable

allstarr/Controllers/AdminController.cs

@@ -502,6 +502,92 @@ public class AdminController : ControllerBase
         return Ok(new { message = "Cache cleared", filesDeleted = clearedFiles });
     }
     
+    /// <summary>
+    /// Restart the allstarr container to apply configuration changes
+    /// </summary>
+    [HttpPost("restart")]
+    public async Task<IActionResult> RestartContainer()
+    {
+        _logger.LogInformation("Container restart requested from admin UI");
+        
+        try
+        {
+            // Use Docker socket to restart the container
+            var socketPath = "/var/run/docker.sock";
+            
+            if (!System.IO.File.Exists(socketPath))
+            {
+                _logger.LogWarning("Docker socket not available at {Path}", socketPath);
+                return StatusCode(503, new { 
+                    error = "Docker socket not available", 
+                    message = "Please restart manually: docker-compose restart allstarr" 
+                });
+            }
+            
+            // Get container ID from hostname (Docker sets hostname to container ID by default)
+            // Or use the well-known container name
+            var containerId = Environment.MachineName;
+            var containerName = "allstarr";
+            
+            _logger.LogInformation("Attempting to restart container {ContainerId} / {ContainerName}", containerId, containerName);
+            
+            // Create Unix socket HTTP client
+            var handler = new SocketsHttpHandler
+            {
+                ConnectCallback = async (context, cancellationToken) =>
+                {
+                    var socket = new System.Net.Sockets.Socket(
+                        System.Net.Sockets.AddressFamily.Unix,
+                        System.Net.Sockets.SocketType.Stream,
+                        System.Net.Sockets.ProtocolType.Unspecified);
+                    
+                    var endpoint = new System.Net.Sockets.UnixDomainSocketEndPoint(socketPath);
+                    await socket.ConnectAsync(endpoint, cancellationToken);
+                    
+                    return new System.Net.Sockets.NetworkStream(socket, ownsSocket: true);
+                }
+            };
+            
+            using var dockerClient = new HttpClient(handler)
+            {
+                BaseAddress = new Uri("http://localhost")
+            };
+            
+            // Try to restart by container name first, then by ID
+            var response = await dockerClient.PostAsync($"/containers/{containerName}/restart?t=5", null);
+            
+            if (!response.IsSuccessStatusCode)
+            {
+                // Try by container ID
+                response = await dockerClient.PostAsync($"/containers/{containerId}/restart?t=5", null);
+            }
+            
+            if (response.IsSuccessStatusCode)
+            {
+                _logger.LogInformation("Container restart initiated successfully");
+                return Ok(new { message = "Restarting container...", success = true });
+            }
+            else
+            {
+                var errorBody = await response.Content.ReadAsStringAsync();
+                _logger.LogError("Failed to restart container: {StatusCode} - {Body}", response.StatusCode, errorBody);
+                return StatusCode((int)response.StatusCode, new { 
+                    error = "Failed to restart container", 
+                    message = "Please restart manually: docker-compose restart allstarr" 
+                });
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error restarting container");
+            return StatusCode(500, new { 
+                error = "Failed to restart container", 
+                details = ex.Message,
+                message = "Please restart manually: docker-compose restart allstarr" 
+            });
+        }
+    }
+    
     /// <summary>
     /// Initialize cookie date to current date if cookie exists but date is not set
     /// </summary>