feat(plugin): scaffold RPCP plugin loading core

- Add JarFile-based plugin.json manifest reading and validation
- Implement reflection-based plugin class instantiation (Data or no-arg constructor)
- Wrap Tool objects into OllamaFunctionTool with basic parameter/response handling
- Implement ToolArguments storage and ToolResponse record
- Extract RPCP_SOURCE constant; add plugin name validation
- Update Data interface: getLoadedPlugins() returns LoadedPlugin[]
- Fix launcher package references (me.zacharias.chat → me.neurodock)

TODO: Extract FileSystem from JAR, populate PluginMetadata, complete
OllamaFunctionArgument↔ToolArguments wrapping, invoke plugin lifecycle hooks

Signed-off-by: zacharias <alienfromdia@proton.me>

launcher/build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'java'
+    id 'application'
 }
 
 version = '1.0-SNAPSHOT'
@@ -11,10 +12,14 @@ dependencies {
 
 jar{
     manifest {
-        attributes 'Main-Class': 'me.zacharias.chat.launcher.Launcher'
+        attributes 'Main-Class': 'me.neurodock.launcher.Launcher'
     }
 }
 
+application {
+    mainClass = 'me.neurodock.launcher.Launcher'
+}
+
 java {
     toolchain {
         languageVersion.set(JavaLanguageVersion.of(javaVersion)) // Set Java version