fix(sdk): make command timeout setters non-null

Author: ninan-nn

sdks/sandbox/kotlin/sandbox/src/main/kotlin/com/alibaba/opensandbox/sandbox/domain/models/execd/executions/RunCommandRequest.kt

@@ -76,17 +76,17 @@ class RunCommandRequest private constructor(
          * Maximum execution time; server will terminate the command when reached.
          * If omitted, the server will not enforce any timeout.
          */
-        fun timeout(timeout: Duration?): Builder {
+        fun timeout(timeout: Duration): Builder {
             this.timeout = timeout
             return this
         }
 
         @Deprecated(
             message = "Use java.time.Duration instead.",
-            replaceWith = ReplaceWith("timeout(timeout?.toJavaDuration())", "kotlin.time.toJavaDuration"),
+            replaceWith = ReplaceWith("timeout(timeout.toJavaDuration())", "kotlin.time.toJavaDuration"),
         )
-        fun timeout(timeout: kotlin.time.Duration?): Builder {
-            return timeout(timeout?.toJavaDuration())
+        fun timeout(timeout: kotlin.time.Duration): Builder {
+            return timeout(timeout.toJavaDuration())
         }
 
         fun uid(uid: Int?): Builder {

sdks/sandbox/kotlin/sandbox/src/main/kotlin/com/alibaba/opensandbox/sandbox/domain/models/execd/executions/RunInSessionRequest.kt

@@ -55,17 +55,17 @@ class RunInSessionRequest private constructor(
             return this
         }
 
-        fun timeout(timeout: Duration?): Builder {
+        fun timeout(timeout: Duration): Builder {
             this.timeout = timeout
             return this
         }
 
         @Deprecated(
             message = "Use java.time.Duration instead.",
-            replaceWith = ReplaceWith("timeout(timeout?.toJavaDuration())", "kotlin.time.toJavaDuration"),
+            replaceWith = ReplaceWith("timeout(timeout.toJavaDuration())", "kotlin.time.toJavaDuration"),
         )
-        fun timeout(timeout: kotlin.time.Duration?): Builder {
-            return timeout(timeout?.toJavaDuration())
+        fun timeout(timeout: kotlin.time.Duration): Builder {
+            return timeout(timeout.toJavaDuration())
         }
 
         fun handlers(handlers: ExecutionHandlers?): Builder {

sdks/sandbox/kotlin/sandbox/src/main/kotlin/com/alibaba/opensandbox/sandbox/domain/services/Commands.kt

@@ -116,14 +116,14 @@ interface Commands {
         workingDirectory: String? = null,
         timeout: Duration? = null,
     ): Execution {
-        return runInSession(
-            sessionId,
+        val builder =
             RunInSessionRequest.builder()
                 .command(command)
                 .workingDirectory(workingDirectory)
-                .timeout(timeout)
-                .build(),
-        )
+        if (timeout != null) {
+            builder.timeout(timeout)
+        }
+        return runInSession(sessionId, builder.build())
     }
 
     @Deprecated(