feat: add MMGame backend and frontend source code

backend/test_npc.py

@@ -0,0 +1,29 @@
+import httpx, json, time
+
+c = httpx.Client()
+base = 'http://localhost:8000'
+
+g = c.post(base + '/api/games/create', json={'script_id': 'script_fog', 'human_role_id': 'role_detective'}).json()
+gid = g['game_id']
+print('Game:', gid[:8])
+
+s = c.get(base + f'/api/games/{gid}/state').json()
+for p in s['players']:
+    print(f'  {p["role_name"]} (human={p["is_human"]})')
+
+c.post(base + f'/api/games/{gid}/start')
+print('Started')
+
+ch = c.post(base + f'/api/games/{gid}/chat', json={
+    'sender_role_id': 'role_detective', 'type': 'public', 'content': '各位，案发时你们在哪？'
+}).json()
+print('Chat sent:', ch['status'])
+
+time.sleep(1.5)
+
+s2 = c.get(base + f'/api/games/{gid}/state').json()
+print(f'\nMessages ({len(s2["messages"])}):')
+for m in s2['messages'][-6:]:
+    print(f'  [{m["sender_name"]}] {m["content"][:60]}')
+
+print('\n=== NPC auto-response test passed ===')