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>

Plugin-API/src/main/java/me/neurodock/plugin/Plugin.java

@@ -9,6 +9,10 @@ import org.jetbrains.annotations.NotNull;
  * Entry point for the plugin, this is required for the plugin to work, and you MUST annotate it with {@link PluginEntryPoint}
  */
 public abstract class Plugin {
+    /**
+     * This is a magic constant plugin name used for when a plugin's name cant be loaded
+     */
+    public static final String UNKNOWN_PLUGIN = "UNKNOWN PLUGIN";
 
     /**
      * This shuld be used if {@link PluginEntryPoint#requireData()} is false (default)
@@ -29,12 +33,12 @@ public abstract class Plugin {
     public void onInit(){}
 
     /**
-     * This will be called if the core gets a "fetal" exception or fails to fetch certain info
+     * This will be called if the core gets a "fetal" exception or fails to fetch certain info AND the plugin was able to be loaded.
      */
     public void onDisable(){}
 
     /**
-     * This will be called after all plugins have been initialised; here it is safe to perform potential stuff where you load data from optional dependencies, or similar things
+     * This will be called after all plugins have been initialized; here it is safe to perform potential stuff where you load data from optional dependencies, or similar things
      */
     public void onEnable(){}