chore: update project structure with contracts and services for CaddyManager, including configuration and Docker integration

CaddyManager.Contracts/Models/Caddy/CaddyConfigurationInfo.cs

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+namespace CaddyManager.Contracts.Models.Caddy;
+
+/// <summary>
+/// Wraps the information parsed from the Caddy configuration file.
+/// </summary>
+public class CaddyConfigurationInfo
+{
+    /// <summary>
+    /// Hostnames that are configured in the Caddyfile.
+    /// </summary>
+    public List<string> Hostnames { get; set; } = [];
+    
+    /// <summary>
+    /// The hostname of the reverse proxy server.
+    /// </summary>
+    public string ReverseProxyHostname { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Ports being used with the reverse proxy hostname
+    /// </summary>
+    public List<int> ReverseProxyPorts { get; set; } = [];
+
+    /// <summary>
+    /// The name of the configuration file.
+    /// </summary>
+    public string FileName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Aggregated ports for the reverse proxy hostname from all configurations.
+    /// </summary>
+    public List<int> AggregatedReverseProxyPorts { get; set; } = [];
+
+    public override bool Equals(object? obj)
+    {
+        if (obj is not CaddyConfigurationInfo other)
+            return false;
+        return FileName == other.FileName;
+    }
+
+    public override int GetHashCode()
+    {
+        return FileName.GetHashCode();
+    }
+}

CaddyManager.Contracts/Models/Caddy/CaddyDeleteOperationResponse.cs

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+namespace CaddyManager.Contracts.Models.Caddy;
+
+/// <summary>
+/// Class to wrap the response of a Caddy delete operation
+/// </summary>
+public class CaddyDeleteOperationResponse : CaddyOperationResponse
+{
+    /// <summary>
+    /// List of configurations that were successfully deleted
+    /// </summary>
+    public List<string> DeletedConfigurations { get; set; } = [];
+}

CaddyManager.Contracts/Models/Caddy/CaddyOperationResponse.cs

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+namespace CaddyManager.Contracts.Models.Caddy;
+
+/// <summary>
+/// Class to wrap the response of a generic Caddy operation
+/// </summary>
+public class CaddyOperationResponse
+{
+    private string _message = string.Empty;
+
+    /// <summary>
+    /// Indicates if the operation was successful
+    /// </summary>
+    public bool Success { get; set; }
+
+    /// <summary>
+    /// Message to describe the operation result to provide more context
+    /// </summary>
+    public string Message
+    {
+        get => _message;
+        set => _message = value ?? string.Empty;
+    }
+}

CaddyManager.Contracts/Models/Caddy/CaddySaveConfigurationRequest.cs

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+namespace CaddyManager.Contracts.Models.Caddy;
+
+/// <summary>
+/// Wraps the information needed to save a Caddy configuration
+/// </summary>
+public class CaddySaveConfigurationRequest
+{
+    /// <summary>
+    /// Indicates if the configuration is new
+    /// </summary>
+    public bool IsNew { get; set; }
+    
+    /// <summary>
+    /// Name of the Caddy configuration file
+    /// </summary>
+    public required string FileName { get; init; } = string.Empty;
+    
+    /// <summary>
+    /// Content of the Caddy configuration file
+    /// </summary>
+    public string Content { get; set; } = string.Empty;
+}