feat(liblogc): 统一集中式日志客户端库 + 全量迁移

新增:
- liblogc/: C++ 统一日志库 (libus_logc.so)，支持 set_endpoint/set_service_name/set_level
- pymsg/pymsg/logc.py: Python 统一日志模块，基于 AsyncRpcQueue

C++ 迁移 (删除 6 份本地 LogC.hpp 副本):
- ca, gateway: <us/LogC.hpp> + set_service_name
- captcha2, confs2, smtp3: using qing::LogC + set_service_name
- core: ConfsLogC → qing::LogC (ConfsTask.cpp)
- 所有 Makefile 添加 -lus_logc

Python 迁移 (6 个 log_client.py → 4 行薄包装):
- smtp, redirect80, confs, captcha, dnfs, static
- 全部委托到 pymsg.logc.LogClient

Go (waf): 保持现状，自成体系

ca/Makefile

@@ -3,7 +3,7 @@ APP_NAME := ca
 INSTL_DIR := /usr/local/bin
 CPP := g++
 INCS := -I inc/ -I ../libmsg/inc
-MY_LIBS := -L/usr/lib -L../libmsg/build -lus_http -lus_httpclient -lus_crypt -lus_msg
+MY_LIBS := -L/usr/lib -L../libmsg/build -lus_http -lus_httpclient -lus_crypt -lus_msg -lus_logc
 LIBS := -pthread -lcurl -lssl -lz -lcrypto -lboost_json -lboost_program_options -Wl,-rpath,$(shell cd ../libmsg/build && pwd)
 CPPFLAGS := --std=c++20 -pipe -pthread # -Wall -Werror
 BUILD_DIR = build
@@ -13,7 +13,7 @@ $(shell mkdir -p $(BUILD_DIR))
 all: $(BUILD_DIR)/$(APP_NAME).out
 $(BUILD_DIR)/$(APP_NAME).out:	$(BUILD_DIR)/main.o
 	$(CPP) $^ $(LIBS) $(MY_LIBS) -o $@
-$(BUILD_DIR)/main.o:	src/main.cpp inc/DbC.hpp inc/LogC.hpp inc/Conf.hpp inc/ExpBase.hpp inc/LocalTime.hpp
+$(BUILD_DIR)/main.o:	src/main.cpp inc/DbC.hpp inc/Conf.hpp inc/ExpBase.hpp inc/LocalTime.hpp
 	$(CPP) $(CPPFLAGS) -c $< $(INCS) -o $@
 clear:
 	@rm -rvf build/