feat: complete assembly mesh relay control path

- synchronize STM8 application and external flash layout updates\n- add assembly bootloader and assembly application test projects\n- add UART1 interrupt receive ring buffer\n- parse JDY-28M Mesh outer frames and source addresses\n- add CRC-16/MODBUS validation\n- implement relay control command 0x01 and response 0x81\n- support unicast and broadcast relay control frames\n- update host protocol, OTA documents, and serial tools

STM8_app_asm/Makefile

@@ -0,0 +1,33 @@
+# STM8S003F3P6 汇编主程序实验工程。
+# 主程序固定从0x8500开始链接，与汇编Bootloader的新地址布局匹配。
+
+PROJECT := stm8_app_asm
+BUILD_DIR := build
+AS := sdasstm8
+LD := sdldstm8
+PACKIHX := packihx
+
+ASMFLAGS := -plosgff
+LINKFLAGS := -mjwxu -b HOME=0x8500 -b CODE=0x8568
+OBJECT := $(BUILD_DIR)/app_vectors.rel
+IHX := $(BUILD_DIR)/$(PROJECT).ihx
+HEX := $(BUILD_DIR)/$(PROJECT).hex
+
+.PHONY: all clean
+
+all: $(HEX)
+
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
+
+$(OBJECT): src/app_vectors.asm | $(BUILD_DIR)
+	$(AS) $(ASMFLAGS) -o $@ $<
+
+$(IHX): $(OBJECT)
+	$(LD) $(LINKFLAGS) -i $@ $^
+
+$(HEX): $(IHX)
+	$(PACKIHX) $< > $@
+
+clean:
+	rm -rf $(BUILD_DIR)