refactor: SDK 包结构——transports/firmware 分包、bridge_server 入包+ppclock-bridge 入口、fw 工具入 SDK 域，151 测试全绿

tests/test_cli.py

@@ -154,7 +154,7 @@ class TestCommands:
         assert FakeTransport.instances[0].epd_writes == [bytes([0x01])]
 
     def test_scan(self, capsys, monkeypatch):
-        import ppclock.transport as tr
+        import ppclock.transports.local as tr
         async def fake_scan(timeout=5.0, name_prefix="NRF-"):
             return [{"name": "NRF-TEST", "address": "AA:BB", "rssi": -50}]
         monkeypatch.setattr(tr, "scan", fake_scan)
@@ -242,7 +242,7 @@ _ORIG_MAKE = cli._make_transport
 class TestViaBridge:
     def test_via_bridge_creates_bridge_transport(self):
         import argparse
-        from ppclock.bridge import BridgeTransport
+        from ppclock.transports.bridge import BridgeTransport
         args = argparse.Namespace(mac="AA:BB", timeout=5.0, via="bridge://192.168.61.35:8971")
         t = _ORIG_MAKE(args)
         assert isinstance(t, BridgeTransport)
@@ -257,12 +257,12 @@ class TestViaBridge:
 
     def test_via_local_creates_ble(self):
         import argparse
-        from ppclock.transport import BLETransport
+        from ppclock.transports.local import BLETransport
         args = argparse.Namespace(mac=None, timeout=5.0, via=None)
         assert isinstance(_ORIG_MAKE(args), BLETransport)
 
     def test_scan_uses_bridge(self, capsys, monkeypatch):
-        import ppclock.bridge as br
+        import ppclock.transports.bridge as br
         called = {}
 
         async def fake_scan(host, port, timeout=5.0):
@@ -275,7 +275,7 @@ class TestViaBridge:
         assert out["data"]["devices"][0]["name"] == "NRF-BR"
 
     def test_env_var_fallback(self, capsys, monkeypatch):
-        import ppclock.bridge as br
+        import ppclock.transports.bridge as br
         called = {}
 
         async def fake_scan(host, port, timeout=5.0):