Speed up AINode CI by consolidating tests and caching PyInstaller output

- Merge 5 AINode IT test classes (DeviceManage, ModelManage, CallInference,
  Forecast, InstanceManagement) into AINodeSharedClusterIT that shares a
  single 1C1D1A cluster, reducing cluster startups from 8 to 3 (~20min saved)
- Convert AINodeClusterConfigIT from @Before/@after to @BeforeClass/@afterclass,
  merging both dialect tests into one method to eliminate a redundant cluster restart
- Add hash-based dist caching to build_binary.py: computes SHA256 of AINode source
  files and skips PyInstaller rebuild when source hasn't changed (~11min saved)
- Cache stored at ~/.cache/iotdb-ainode-build/dist-cache/, survives mvn clean

Author: JackieTien97

integration-test/src/test/java/org/apache/iotdb/ainode/it/AINodeCallInferenceIT.java

@@ -24,16 +24,15 @@
 import org.apache.iotdb.itbase.category.AIClusterIT;
 import org.apache.iotdb.itbase.env.BaseEnv;
 
-import org.junit.After;
+import org.junit.AfterClass;
 import org.junit.Assert;
-import org.junit.Before;
+import org.junit.BeforeClass;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 import org.junit.runner.RunWith;
 
 import java.sql.Connection;
 import java.sql.ResultSet;
-import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
 import java.sql.Statement;
 
@@ -44,39 +43,56 @@
 @Category({AIClusterIT.class})
 public class AINodeClusterConfigIT {
 
-  @Before
-  public void setUp() throws Exception {
-    // Init 1C1D1A cluster environment
+  @BeforeClass
+  public static void setUp() throws Exception {
     EnvFactory.getEnv().initClusterEnvironment(1, 1);
   }
 
-  @After
-  public void tearDown() throws Exception {
+  @AfterClass
+  public static void tearDown() throws Exception {
     EnvFactory.getEnv().cleanClusterEnvironment();
   }
 
   @Test
-  public void aiNodeRegisterAndRemoveTestInTree() throws SQLException {
+  public void aiNodeRegisterAndRemoveTest() throws SQLException {
+    String show_sql = "SHOW AINODES";
+    String title = "NodeID,Status,InternalAddress,InternalPort";
+
+    // Verify AINode exists via both dialects before removal
     try (Connection connection = EnvFactory.getEnv().getConnection(BaseEnv.TREE_SQL_DIALECT);
         Statement statement = connection.createStatement()) {
-      aiNodeRegisterAndRemoveTest(statement);
+      verifyAINodeExists(statement, show_sql, title);
+    }
+    try (Connection connection = EnvFactory.getEnv().getConnection(BaseEnv.TABLE_SQL_DIALECT);
+        Statement statement = connection.createStatement()) {
+      verifyAINodeExists(statement, show_sql, title);
     }
-  }
 
-  @Test
-  public void aiNodeRegisterAndRemoveTestInTable() throws SQLException {
+    // Remove AINode
+    try (Connection connection = EnvFactory.getEnv().getConnection(BaseEnv.TREE_SQL_DIALECT);
+        Statement statement = connection.createStatement()) {
+      statement.execute("REMOVE AINODE");
+      waitForAINodeRemoval(statement, show_sql, title);
+    }
+
+    // Verify removal is visible via table dialect as well
     try (Connection connection = EnvFactory.getEnv().getConnection(BaseEnv.TABLE_SQL_DIALECT);
         Statement statement = connection.createStatement()) {
-      aiNodeRegisterAndRemoveTest(statement);
+      try (ResultSet resultSet = statement.executeQuery(show_sql)) {
+        checkHeader(resultSet.getMetaData(), title);
+        int count = 0;
+        while (resultSet.next()) {
+          count++;
+        }
+        assertEquals(0, count);
+      }
     }
   }
 
-  private void aiNodeRegisterAndRemoveTest(Statement statement) throws SQLException {
-    String show_sql = "SHOW AINODES";
-    String title = "NodeID,Status,InternalAddress,InternalPort";
-    try (ResultSet resultSet = statement.executeQuery(show_sql)) {
-      ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
-      checkHeader(resultSetMetaData, title);
+  private static void verifyAINodeExists(Statement statement, String showSql, String title)
+      throws SQLException {
+    try (ResultSet resultSet = statement.executeQuery(showSql)) {
+      checkHeader(resultSet.getMetaData(), title);
       int count = 0;
       while (resultSet.next()) {
         assertEquals("2", resultSet.getString(1));
@@ -85,22 +101,23 @@ private void aiNodeRegisterAndRemoveTest(Statement statement) throws SQLExceptio
       }
       assertEquals(1, count);
     }
-    String remove_sql = "REMOVE AINODE";
-    statement.execute(remove_sql);
+  }
+
+  private static void waitForAINodeRemoval(Statement statement, String showSql, String title)
+      throws SQLException {
     for (int retry = 0; retry < 500; retry++) {
-      try (ResultSet resultSet = statement.executeQuery(show_sql)) {
-        ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
-        checkHeader(resultSetMetaData, title);
+      try (ResultSet resultSet = statement.executeQuery(showSql)) {
+        checkHeader(resultSet.getMetaData(), title);
         int count = 0;
         while (resultSet.next()) {
           count++;
         }
         if (count == 0) {
-          return; // Successfully removed the AI node
+          return;
         }
       }
       try {
-        Thread.sleep(1000); // Wait before retrying
+        Thread.sleep(1000);
       } catch (InterruptedException e) {
         Thread.currentThread().interrupt();
       }