Fix: Add POST support for /reset and /step endpoints

- /reset now accepts both GET and POST
- Added /step POST endpoint
- Maintains env_instance state between calls

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

server/app.py

@@ -5,6 +5,8 @@ from env import create_env
 
 app = FastAPI()
 
+env_instance = None
+
 
 @app.get("/")
 def root():
@@ -12,10 +14,34 @@ def root():
 
 
 @app.get("/reset")
+@app.post("/reset")
 def reset(task: str = "easy"):
+    global env_instance
+    try:
+        env_instance = create_env(task)
+        obs = env_instance.reset()
+        return {
+            "status": "ok",
+            "task": task,
+            "observation": str(obs)
+        }
+    except Exception as e:
+        return {"error": str(e)}
+
+
+@app.post("/step")
+def step(action: str = "analyze_pattern"):
+    global env_instance
     try:
-        env = create_env(task)
-        obs = env.reset()
-        return {"status": "ok", "task": task}
+        if env_instance is None:
+            env_instance = create_env()
+            env_instance.reset()
+        obs, reward, done, info = env_instance.step(action)
+        return {
+            "observation": str(obs),
+            "reward": reward,
+            "done": done,
+            "info": info
+        }
     except Exception as e:
         return {"error": str(e)}