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

CaddyManager.Contracts/Caddy/ICaddyConfigurationParsingService.cs

@@ -0,0 +1,38 @@
+namespace CaddyManager.Contracts.Caddy;
+
+/// <summary>
+/// Contract for a service that parses Caddy configuration files.
+/// </summary>
+public interface ICaddyConfigurationParsingService
+{
+    /// <summary>
+    /// Extracts outermost hostname declarations from a Caddyfile content.
+    /// i.e.
+    /// ```
+    /// caddy.domain.name {
+    ///     route {
+    ///         reverse_proxy localhost:8080
+    ///         encode zstd gzip
+    ///     }
+    /// }
+    /// ```
+    /// will return `["caddy.domain.name"]`.
+    /// </summary>
+    /// <param name="caddyfileContent"></param>
+    /// <returns></returns>
+    List<string> GetHostnamesFromCaddyfileContent(string caddyfileContent);
+    
+    /// <summary>
+    /// Extracts the reverse proxy target from a Caddyfile content.
+    /// </summary>
+    /// <param name="caddyfileContent"></param>
+    /// <returns></returns>
+    string GetReverseProxyTargetFromCaddyfileContent(string caddyfileContent);
+    
+    /// <summary>
+    /// Extracts the ports being used with the reverse proxy host
+    /// </summary>
+    /// <param name="caddyfileContent"></param>
+    /// <returns></returns>
+    List<int> GetReverseProxyPortsFromCaddyfileContent(string caddyfileContent);
+}