refactor: me.zacharias.chat → me.neurodock, org rename cleanup

- Renamed package from me.zacharias.chat to me.neurodock across all 8 modules
- Updated Gradle group from me.zacharias.neurodock to me.neurodock
- Updated README and other files to reflect new Gitea org URL (Chat_things → neurodock)

Dev note: 95 files touched. The Great Refactor is complete, long may it rest.

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

@@ -0,0 +1,11 @@
+package me.neurodock.plugin.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface InjectPluginMetadata {
+}