feat: evolve textfx into a mini shell

tests/test_textfx_runtime_limits.py

@@ -0,0 +1,33 @@
+import nonebot
+
+nonebot.init()
+
+from konabot.plugins.handle_text.__init__ import _get_textfx_user_key
+
+
+class DummyEvent:
+    def __init__(self, self_id=None, user_id=None, group_id=None, session_id=None):
+        self.self_id = self_id
+        self.user_id = user_id
+        self.group_id = group_id
+        self._session_id = session_id
+
+    def get_session_id(self):
+        if self._session_id is None:
+            raise RuntimeError('no session')
+        return self._session_id
+
+
+def test_textfx_user_key_group():
+    evt = DummyEvent(self_id='123', user_id='456', group_id='789')
+    assert _get_textfx_user_key(evt) == '123:789:456'
+
+
+def test_textfx_user_key_private():
+    evt = DummyEvent(self_id='123', user_id='456')
+    assert _get_textfx_user_key(evt) == '123:private:456'
+
+
+def test_textfx_user_key_session_fallback():
+    evt = DummyEvent(session_id='console:alice')
+    assert _get_textfx_user_key(evt) == 'session:console:alice'