csrts: Add CSRTS stub and load from kernel

Signed-off-by: Chloe M. <chloe@mensia.org>

service/csrts/Makefile

@@ -0,0 +1,16 @@
+#
+# Copyright (c) 2026, Chloe M.
+# Provided under the BSD-3 clause
+#
+# Description:  Client server runtime service build script
+# Author:       Chloe M.
+#
+
+include ../mk/user.mk
+
+.PHONY: all
+all: server
+
+.PHONY: server
+server:
+	cd server/; $(MAKE) $(PASSDOWN_ARGS)

service/csrts/server/Makefile

@@ -0,0 +1,26 @@
+#
+# Copyright (c) 2026, Chloe M.
+# Provided under the BSD-3 clause
+#
+# Description:  Client server runtime service build script
+# Author:       Chloe M.
+#
+
+CFILES = $(shell find . -name "*.c")
+OFILES = $(CFILES:.c=.o)
+
+CFLAGS = $(SYS_CFLAGS)
+CRT_FILES = $(shell find $(PT_URT_CRT) -name "*.o")
+
+SERVER_OUT = \
+	$(PT_PROJECT_ROOT)/service/base/boot/csrts.sys
+
+.PHONY: all
+all: $(SERVER_OUT)
+
+.PHONY: $(SERVER_OUT)
+$(SERVER_OUT): $(OFILES)
+	$(SYS_LD) $(OFILES) $(CRT_FILES) -T$(USER_LDS) -o $@
+
+%.o: %.c
+	$(SYS_CC) -c $< $(CFLAGS) -o $@

service/csrts/server/init.c

@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: CSRTS init
+ * Author:      Chloe M.
+ */
+
+#include <ptdef.h>
+
+VOID
+Main(VOID)
+{
+}