refactor(examples): group trace examples under examples/system/tracing/

Move 6 trace-related examples (app_trace_basic, app_trace_to_plot,
esp_trace, gcov, sysview_tracing, sysview_tracing_heap_log) from
examples/system/ into a dedicated examples/system/tracing/
subdirectory for better organization.

Update all path references across documentation (en + zh_CN),
build-test-rules, CI configs and component READMEs.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KZAGzon27T12sGbDPPbZ8G

docs/en/api-guides/tracing/custom-trace-library.rst

@@ -69,4 +69,4 @@ To capture FreeRTOS events, the external component implementing a trace encoder
 Application Example
 -------------------
 
-- :example:`system/esp_trace_custom_library` is a minimal template that wires up an external encoder, demonstrates the FreeRTOS trace-hook include chain, and shows cross-core serialization through the encoder lock.
+- :example:`system/tracing/esp_trace_custom_library` is a minimal template that wires up an external encoder, demonstrates the FreeRTOS trace-hook include chain, and shows cross-core serialization through the encoder lock.

docs/en/api-guides/tracing/gcov.rst

@@ -23,4 +23,4 @@ Coverage data can be dumped either at a hard-coded point in your application (ov
 Application Example
 -------------------
 
-- :example:`system/gcov` demonstrates how to add code coverage to a project and collect coverage data over JTAG.
+- :example:`system/tracing/gcov` demonstrates how to add code coverage to a project and collect coverage data over JTAG.

docs/en/api-guides/tracing/index.rst

@@ -101,8 +101,8 @@ Related Documentation
 Examples
 --------
 
-- :example:`system/app_trace_basic`: Basic application tracing
-- :example:`system/sysview_tracing`: SystemView tracing example
-- :example:`system/sysview_tracing_heap_log`: Heap tracing with SystemView
-- :example:`system/gcov`: Source code coverage over JTAG
-- :example:`system/esp_trace_custom_library`: External trace library integration template
+- :example:`system/tracing/app_trace_basic`: Basic application tracing
+- :example:`system/tracing/sysview_tracing`: SystemView tracing example
+- :example:`system/tracing/sysview_tracing_heap_log`: Heap tracing with SystemView
+- :example:`system/tracing/gcov`: Source code coverage over JTAG
+- :example:`system/tracing/esp_trace_custom_library`: External trace library integration template

docs/en/api-guides/tracing/sysview.rst

@@ -136,5 +136,5 @@ Good instructions on how to install, configure, and visualize data in Impulse fr
 Application Examples
 --------------------
 
-- :example:`system/sysview_tracing` demonstrates how to trace FreeRTOS task and system events using SEGGER SystemView.
-- :example:`system/sysview_tracing_heap_log` demonstrates heap allocation tracing alongside SystemView events.
+- :example:`system/tracing/sysview_tracing` demonstrates how to trace FreeRTOS task and system events using SEGGER SystemView.
+- :example:`system/tracing/sysview_tracing_heap_log` demonstrates heap allocation tracing alongside SystemView events.

docs/en/api-guides/tracing/transports.rst

@@ -396,8 +396,8 @@ Optional arguments:
 Application Examples
 --------------------
 
-- :example:`system/app_trace_basic` demonstrates how to use the Application Level Tracing Library to log messages to a host via JTAG, providing a faster alternative to UART logs.
-- :example:`system/app_trace_to_plot` demonstrates how to send and plot dummy sensor data to a host via JTAG.
+- :example:`system/tracing/app_trace_basic` demonstrates how to use the Application Level Tracing Library to log messages to a host via JTAG, providing a faster alternative to UART logs.
+- :example:`system/tracing/app_trace_to_plot` demonstrates how to send and plot dummy sensor data to a host via JTAG.
 
 API Reference
 -------------