Unify cache polling on CACHE_STATUS and split API docs.

Replace separate accel/tap snapshot UART commands with one clients[] response
that omits unsubscribed fields; remove snapshot handlers and CLI commands.
Add goTool/docs for WebSocket streams and REST; tap-snapshot REST uses CACHE_STATUS.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/CMakeLists.txt

@@ -18,10 +18,8 @@ idf_component_register(
   "cmd/cmd_version.c"
   "cmd/cmd_client_info.c"
   "cmd/cmd_accel_deadzone.c"
-  "cmd/cmd_accel_snapshot.c"
   "cmd/cmd_accel_stream.c"
   "cmd/cmd_tap_notify.c"
-  "cmd/cmd_tap_snapshot.c"
   "cmd/cmd_cache_status.c"
   "cmd/cmd_espnow_unicast_test.c"
   "cmd/cmd_espnow_find_me.c"