Fix build error by adding version directly to plugin.xml

- Remove patchPluginXml task that was causing compilation error
- Add version element directly in plugin.xml (set to 0.0.1)
- This resolves the "Unresolved reference 'set'" build error

Co-authored-by: Mte90 <403283+Mte90@users.noreply.github.com>

Author: Copilot

ide-plugins/build.gradle.kts

@@ -35,8 +35,4 @@ tasks {
             jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
         }
     }
-    
-    patchPluginXml {
-        version.set(project.version.toString())
-    }
 }

ide-plugins/src/main/resources/META-INF/plugin.xml

@@ -1,6 +1,7 @@
 <idea-plugin>
     <id>com.picocode.rag-assistant</id>
     <name>PicoCode RAG Assistant</name>
+    <version>0.0.1</version>
     <vendor>PicoCode</vendor>
 
     <description><![CDATA[