Refactor and update the relay_chn component.

Refactor relay channel component to support single and multi-channel modes; update CMake configuration and enhance API documentation.

CMakeLists.txt

@@ -1,4 +1,21 @@
-idf_component_register(SRCS "src/relay_chn.c"
-                    INCLUDE_DIRS include
-                    REQUIRES driver
-                    PRIV_REQUIRES esp_timer esp_event)
+set(include_dirs "include")
+set(priv_include_dirs "private_include")
+
+set(srcs "src/relay_chn_core.c"
+         "src/relay_chn_output.c"
+         "src/relay_chn_run_info.c")
+
+if(CONFIG_RELAY_CHN_ENABLE_TILTING)
+    list(APPEND srcs "src/relay_chn_tilt.c")
+endif()
+
+if(CONFIG_RELAY_CHN_COUNT GREATER 1)
+    list(APPEND srcs "src/relay_chn_ctl_multi.c")
+else()
+    list(APPEND srcs "src/relay_chn_ctl_single.c")
+endif()
+
+idf_component_register(SRCS ${srcs}
+                       INCLUDE_DIRS ${include_dirs}
+                       PRIV_INCLUDE_DIRS ${priv_include_dirs}
+                       REQUIRES driver esp_timer esp_event)