♻️ 大幅重构，拆分模块，增加一些MCP相关限制

tests/test_dispatcher.py

@@ -0,0 +1,49 @@
+import asyncio
+import unittest
+
+# ruff: noqa: I001
+import tests.bootstrap  # noqa: F401
+from nonebot_plugin_llmchat.dispatcher import MessageDispatcher
+from nonebot_plugin_llmchat.state import ChatState
+
+
+class DispatcherTests(unittest.IsolatedAsyncioTestCase):
+    async def test_messages_enqueued_while_worker_runs_are_not_stranded(self):
+        started = asyncio.Event()
+        release = asyncio.Event()
+        processed = []
+
+        async def process(_context_id, _is_group, _state, event):
+            processed.append(event)
+            if event == "first":
+                started.set()
+                await release.wait()
+
+        state = ChatState("test", 10, 10)
+        dispatcher = MessageDispatcher(process)
+        await dispatcher.enqueue(1, True, state, "first")
+        await asyncio.wait_for(started.wait(), timeout=1)
+        await dispatcher.enqueue(1, True, state, "second")
+        release.set()
+        await asyncio.wait_for(state.queue.join(), timeout=1)
+
+        assert processed, ["first", "second"]
+        assert state.queue.empty()
+        await dispatcher.shutdown()
+
+    async def test_processor_failure_does_not_stop_the_queue(self):
+        processed = []
+
+        async def process(_context_id, _is_group, _state, event):
+            processed.append(event)
+            if event == "bad":
+                raise RuntimeError("boom")
+
+        state = ChatState("test", 10, 10)
+        dispatcher = MessageDispatcher(process)
+        await dispatcher.enqueue(1, True, state, "bad")
+        await dispatcher.enqueue(1, True, state, "good")
+        await asyncio.wait_for(state.queue.join(), timeout=1)
+
+        assert processed, ["bad", "good"]
+        await dispatcher.shutdown()