Enhance simulation configuration and management features

- Added support for a `max_rounds` parameter in simulation API, allowing users to limit the number of simulation rounds, improving control over simulation duration.
- Updated README.md to reflect the new `max_rounds` parameter and its usage in simulation requests.
- Enhanced error handling for `max_rounds` input validation to ensure it is a positive integer.
- Modified simulation runner and related scripts to incorporate `max_rounds` functionality, ensuring consistent application across Twitter and Reddit simulations.
- Improved logging to indicate when the number of rounds is truncated due to the `max_rounds` setting, enhancing traceability during simulation execution.

backend/scripts/run_reddit_simulation.py

@@ -251,8 +251,12 @@ class RedditSimulationRunner:
         
         return active_agents
     
-    async def run(self):
-        """运行Reddit模拟"""
+    async def run(self, max_rounds: int = None):
+        """运行Reddit模拟
+        
+        Args:
+            max_rounds: 最大模拟轮数（可选，用于截断过长的模拟）
+        """
         print("=" * 60)
         print("OASIS Reddit模拟")
         print(f"配置文件: {self.config_path}")
@@ -264,10 +268,19 @@ class RedditSimulationRunner:
         minutes_per_round = time_config.get("minutes_per_round", 30)
         total_rounds = (total_hours * 60) // minutes_per_round
         
+        # 如果指定了最大轮数，则截断
+        if max_rounds is not None and max_rounds > 0:
+            original_rounds = total_rounds
+            total_rounds = min(total_rounds, max_rounds)
+            if total_rounds < original_rounds:
+                print(f"\n轮数已截断: {original_rounds} -> {total_rounds} (max_rounds={max_rounds})")
+        
         print(f"\n模拟参数:")
         print(f"  - 总模拟时长: {total_hours}小时")
         print(f"  - 每轮时间: {minutes_per_round}分钟")
         print(f"  - 总轮数: {total_rounds}")
+        if max_rounds:
+            print(f"  - 最大轮数限制: {max_rounds}")
         print(f"  - Agent数量: {len(self.config.get('agent_configs', []))}")
         
         print("\n初始化LLM模型...")
@@ -380,6 +393,12 @@ async def main():
         required=True,
         help='配置文件路径 (simulation_config.json)'
     )
+    parser.add_argument(
+        '--max-rounds',
+        type=int,
+        default=None,
+        help='最大模拟轮数（可选，用于截断过长的模拟）'
+    )
     
     args = parser.parse_args()
     
@@ -392,7 +411,7 @@ async def main():
     setup_oasis_logging(os.path.join(simulation_dir, "log"))
     
     runner = RedditSimulationRunner(args.config)
-    await runner.run()
+    await runner.run(max_rounds=args.max_rounds)
 
 
 if __name__ == "__main__":