Refactor: move metadata classes to separate files

Separated SpecificationMetadata, PluginOperationMetadata, and PluginOperationParameterMetadata into their own files with proper namespace. Removed their definitions from PluginMetadata.cs for improved code organization and maintainability.

#49

Author: ziagham

src/FlowSynx.Pluginregistry/Models/PluginMetadata.cs

@@ -21,29 +21,4 @@ public class PluginMetadata
     public string? TargetFlowSynxVersion { get; set; }
     public List<SpecificationMetadata> Specifications { get; set; } = new List<SpecificationMetadata>();
     public List<PluginOperationMetadata> Operations { get; set; } = new List<PluginOperationMetadata>();
-}
-
-public class SpecificationMetadata
-{
-    public string Name { get; set; } = string.Empty;
-    public string? Description { get; set; }
-    public string? Type { get; set; }
-    public string? DefaultValue { get; set; }
-    public bool? IsRequired { get; set; } = false;
-}
-
-public class PluginOperationMetadata
-{
-    public string Name { get; set; } = string.Empty;
-    public string? Description { get; set; }
-    public List<PluginOperationParameterMetadata> Parameters { get; set; } = new List<PluginOperationParameterMetadata>();
-}
-
-public class PluginOperationParameterMetadata
-{
-    public string Name { get; set; } = string.Empty;
-    public string? Description { get; set; }
-    public string? Type { get; set; }
-    public string? DefaultValue { get; set; }
-    public bool? IsRequired { get; set; } = false;
 }

src/FlowSynx.Pluginregistry/Models/PluginOperationMetadata.cs

@@ -0,0 +1,8 @@
+namespace FlowSynx.Pluginregistry.Models;
+
+public class PluginOperationMetadata
+{
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public List<PluginOperationParameterMetadata> Parameters { get; set; } = new List<PluginOperationParameterMetadata>();
+}

src/FlowSynx.Pluginregistry/Models/PluginOperationParameterMetadata.cs

@@ -0,0 +1,10 @@
+namespace FlowSynx.Pluginregistry.Models;
+
+public class PluginOperationParameterMetadata
+{
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public string? Type { get; set; }
+    public string? DefaultValue { get; set; }
+    public bool? IsRequired { get; set; } = false;
+}

src/FlowSynx.Pluginregistry/Models/SpecificationMetadata.cs

@@ -0,0 +1,10 @@
+namespace FlowSynx.Pluginregistry.Models;
+
+public class SpecificationMetadata
+{
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public string? Type { get; set; }
+    public string? DefaultValue { get; set; }
+    public bool? IsRequired { get; set; } = false;
+}