Add code-review-bot module: Gitea webhook, diff chunking and a Spring AI reviewer with cost controls

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjfyTgmERTWLqzafu34Cth

pom.xml

@@ -16,6 +16,7 @@
     <module>onnx-djl</module>
     <module>langgraph4j</module>
     <module>adk</module>
+    <module>code-review-bot</module>
   </modules>
 
   <properties>
@@ -29,6 +30,7 @@
     <!-- Verified on Maven Central 2026-10-14 -->
     <langgraph4j.version>1.9.5</langgraph4j.version>
     <adk.version>1.11.0</adk.version>
+    <spring-ai.version>2.0.1</spring-ai.version>
     <onnxruntime.version>1.31.0</onnxruntime.version>
     <spring-boot.version>4.1.1</spring-boot.version>
     <junit.version>6.1.3</junit.version>