repo hygiene: track the PINK launcher import closure

67 production .py modules that the running PINK service imports but which
were never committed: prod/bingx/ (HTTP client, market/user streams,
journal, config), prod/clean_arch/ adapters/persistence/runtime/dita/dita_v2
production modules and their co-located tests. Rule going forward: every
module imported by launch_dolphin_pink.py / pink_direct.py must appear in
git ls-files. Excludes _backup dirs, __pycache__, and non-code files.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

prod/bingx/factories.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+import asyncio
+
+from nautilus_trader.cache.cache import Cache
+from nautilus_trader.common.component import LiveClock
+from nautilus_trader.common.component import MessageBus
+from nautilus_trader.live.factories import LiveExecClientFactory
+
+from .config import BingxExecClientConfig
+from .http import BingxHttpClient
+from .instrument_provider import BingxInstrumentProvider
+from .execution import BingxExecutionClient
+
+
+class BingxLiveExecClientFactory(LiveExecClientFactory):
+    @staticmethod
+    def create(  # type: ignore[override]
+        loop: asyncio.AbstractEventLoop,
+        name: str,
+        config: BingxExecClientConfig,
+        msgbus: MessageBus,
+        cache: Cache,
+        clock: LiveClock,
+    ) -> BingxExecutionClient:
+        config.validate_mainnet_opt_in()
+        client = BingxHttpClient(config)
+        provider = BingxInstrumentProvider(client=client, config=config.instrument_provider)
+        return BingxExecutionClient(
+            loop=loop,
+            client=client,
+            msgbus=msgbus,
+            cache=cache,
+            clock=clock,
+            instrument_provider=provider,
+            config=config,
+            name=name,
+        )