fix:codeql scan Security issue

Author: msslulu

base/src/main/java/com/tinyengine/it/rag/config/VectorStoreConfig.java

@@ -75,7 +75,7 @@ public EmbeddingModel embeddingModel() {
                                 PoolingMode.MEAN);
                 logInfo("ONNX embedding model initialization successful");
             }
-        } catch (Exception exception) {
+        } catch (IllegalArgumentException  exception) {
             logWarn(
                     "ONNX embedding model initialization failed, using fallback implementation",
                     exception);

base/src/test/java/com/tinyengine/it/service/app/impl/v1/AiChatV1ServiceImplTest.java

@@ -30,6 +30,7 @@
     "PMD.MethodArgumentCouldBeFinal",
     "PMD.OnlyOneReturn",
     "PMD.TestClassWithoutTestCases",
+    "PMD.DataflowAnomalyAnalysis",
     "PMD.TooManyMethods"
 })
 class AiChatV1ServiceImplTest {