refactor!: 协议帧与业务事件分流，各接入方式配专有协议处理器

BaseProtocol 从 emitter.py 移入新模块 protocol.py，接口由 register(emitter)
改为 async on_frame(payload)（返回需回送的响应体）；协议处理器不再注册进
emitter，而由 run_loop 注入对应的 connecter，由适配器逐帧调用。

破坏性变更：只有 op=0 的业务事件进事件队列交给 EventEmitter 分发，
HELLO/READY/INVALID_SESSION/op=13 等协议帧在连接器内就地处理——用户 handler
不再收到协议帧（此前 HELLO/INVALID_SESSION 等会路由到 handler）。
EventEmitter.register_protocol()/handle() 与 emitter 持有协议层的机制删除，
协议类不再用 register() 注册 handler。

附带修掉一处时序耦合：INVALID_SESSION 的会话重置此前依赖分发泵在重连前
消费掉该事件（慢 handler 会推迟它，导致带着已死 session_id 去 RESUME），
现在连接器在 break 重连前同步完成重置。

同时做的事件流优化：
- emit() 先取事件名、无 listener 时不构造 Event（未订阅事件省一次对象与拷贝）
- Event.data 改为惰性拷贝（只用 .typed/.raw 的 handler 不再触发 dict(d)）
- ws 重连收尾 await 被取消的 reply/heartbeat 任务，避免异常无人取用
- EventQueue.put_event/put_reply 去掉多余的 return await

测试 80 全绿（新增协议帧处理测试组、ws 集成断言协议帧不触达 handler），
ruff/pyright 干净。文档 ARCHITECTURE/API/GUIDE/README/CHANGELOG 同步。

tests/test_route.py

@@ -1,36 +1,128 @@
+"""协议帧处理测试：协议处理器（WebsocketProtocol）就近处理握手续传语义，
+不进事件分发；只有业务事件（op=0）由 emitter 分发给用户 handler。"""
+
 import pytest
 
+from qqbotsdk.config import Config
 from qqbotsdk.emitter import EventEmitter
 from qqbotsdk.model import Opcode
+from qqbotsdk.session import Session
+from qqbotsdk.ws_protocol import WebsocketProtocol
 
 
-@pytest.fixture
-def emitter() -> EventEmitter:
-    return EventEmitter()  # 无参构造，覆盖 queue 默认自建路径
+class FakeToken:
+    """手搓 token 源，避免构造真实 AccessToken 去发网络请求。"""
+
+    async def get_access_token(self) -> str:
+        return "tok"
 
 
-def test_route_dispatch_uses_t(emitter: EventEmitter):
-    routed = emitter._route({"op": Opcode.DISPATCH, "t": "READY", "d": {}})
-    assert routed is not None
-    op, name, event = routed
-    assert op == Opcode.DISPATCH
-    assert name == "READY"
-    assert event.type == "READY"
+def make_protocol(session: Session | None = None) -> tuple[WebsocketProtocol, Session]:
+    session = session or Session()
+    config = Config(
+        app_id="app",
+        app_secret="secret",
+        base_url="https://api.bot.qq.com",
+        timeout=None,  # type: ignore[arg-type]
+        connecter="websocket",
+        intents_file="no-such.toml",
+        webhook_host="0.0.0.0",
+        webhook_port=8080,
+        webhook_path="/x",
+    )
+    return WebsocketProtocol(config, session, FakeToken()), session  # type: ignore[arg-type]
 
 
-def test_route_non_dispatch_uses_opcode_name(emitter: EventEmitter):
-    routed = emitter._route({"op": Opcode.HELLO, "d": {"heartbeat_interval": 1}})
-    assert routed is not None
-    assert routed[1] == "HELLO"
+@pytest.mark.asyncio
+async def test_hello_without_session_identifies():
+    protocol, _ = make_protocol()
+    reply = await protocol.on_frame(
+        {"op": Opcode.HELLO, "d": {"heartbeat_interval": 1}}
+    )
+    assert reply is not None
+    assert reply["op"] == Opcode.IDENTIFY
+    assert reply["d"]["token"] == "QQBot tok"
+    assert reply["d"]["shard"] == (0, 1)
 
 
-def test_route_rejects_missing_op(emitter: EventEmitter):
-    assert emitter._route({"d": {}}) is None
+@pytest.mark.asyncio
+async def test_hello_with_session_resumes():
+    protocol, session = make_protocol()
+    session.session_id = "S1"
+    session.update_sequence(7)
+    reply = await protocol.on_frame({"op": Opcode.HELLO, "d": {}})
+    assert reply is not None
+    assert reply["op"] == Opcode.RESUME
+    assert reply["d"]["session_id"] == "S1"
+    assert reply["d"]["seq"] == 7
 
 
-def test_route_rejects_unknown_opcode(emitter: EventEmitter):
-    assert emitter._route({"op": 999}) is None
+@pytest.mark.asyncio
+async def test_ready_captures_session_without_reply():
+    protocol, session = make_protocol()
+    reply = await protocol.on_frame(
+        {"op": Opcode.DISPATCH, "t": "READY", "d": {"session_id": "S9"}}
+    )
+    assert reply is None
+    assert session.session_id == "S9"
 
 
-def test_route_rejects_dispatch_without_t(emitter: EventEmitter):
-    assert emitter._route({"op": Opcode.DISPATCH, "d": {}}) is None
+@pytest.mark.asyncio
+async def test_sequence_is_tracked_from_frames():
+    protocol, session = make_protocol()
+    await protocol.on_frame({"op": Opcode.DISPATCH, "t": "X", "s": 5, "d": {}})
+    await protocol.on_frame(
+        {"op": Opcode.DISPATCH, "t": "X", "s": 3, "d": {}}
+    )  # 回退被忽略
+    assert session.seq == 5
+
+
+@pytest.mark.asyncio
+async def test_invalid_session_resets_only_when_not_resumable():
+    protocol, session = make_protocol()
+    session.session_id = "S1"
+    await protocol.on_frame({"op": Opcode.INVALID_SESSION, "d": True})
+    assert session.session_id == "S1"  # 可续传，会话保留
+    await protocol.on_frame({"op": Opcode.INVALID_SESSION, "d": False})
+    assert session.session_id is None  # 不可续传，下次重连走 IDENTIFY
+
+
+@pytest.mark.asyncio
+async def test_business_event_returns_no_reply():
+    """业务事件（op=0 非 READY）协议层不产生应答，只留给 emitter 分发。"""
+    protocol, _ = make_protocol()
+    reply = await protocol.on_frame(
+        {"op": Opcode.DISPATCH, "t": "GROUP_AT_MESSAGE_CREATE", "d": {"content": "hi"}}
+    )
+    assert reply is None
+
+
+@pytest.mark.asyncio
+async def test_emit_drops_protocol_frames():
+    """协议帧不进分发队列；万一进来也不得触达业务 handler。"""
+    emitter = EventEmitter()
+    called: list[str] = []
+
+    @emitter.on(Opcode.HELLO)
+    async def on_hello(_):
+        called.append("hello")
+
+    await emitter.emit({"op": Opcode.HELLO, "d": {"heartbeat_interval": 1}})
+    assert called == []
+
+
+@pytest.mark.asyncio
+async def test_emit_drops_dispatch_without_t():
+    emitter = EventEmitter()
+
+    @emitter.on("READY")
+    async def on_ready(_):
+        raise AssertionError("不应被调用")
+
+    await emitter.emit({"op": Opcode.DISPATCH, "d": {}})
+
+
+@pytest.mark.asyncio
+async def test_emit_ignores_missing_op():
+    emitter = EventEmitter()
+    await emitter.emit({"d": {}})  # 无 op，静默跳过