refactor(console): phase 2 — channel-as-semantic key; decouple executor from UI colors

Make ConsoleChannel the canonical semantic classification of every console
line. Producers (command executor, app log forwarders, result formatter) tag
each line with a channel; the UI derives both the text color and the left
accent-bar color from it at draw time, and the output filter keys off it.

This replaces the prior scheme of storing an ImU32 color per line and then
reverse-engineering the source from color-equality plus a "[daemon] "/"[xmrig] "
/"[app] "/"[rpc] " text prefix. Consequences:

- ConsoleLine now stores {text, ConsoleChannel} — no per-line color.
- addLine()/addRpcTraceLine() take a channel; the redundant text prefixes are
  gone (the accent bar carries the origin).
- The executor's ConsoleAddLineFn hands a channel, not an ImU32, so the backend
  no longer depends on ConsoleTab::COLOR_* — FullNode/Lite executors emit clean
  text + channel.
- The theme-remap loop that rewrote stored colors on light/dark flip is deleted;
  colors are resolved per-channel each frame (refreshColors on flip only).
- ConsoleOutputFilter drops its color fields; consoleLinePassesFilter() keys off
  the channel. Test updated to the channel-based API.
- Added a Warning channel (amber severity peer of Error/Success) so the
  notification + logger warning forwarders keep their color.

Full-node + lite build clean; ctest green; source hygiene clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/windows/console_command_executor.h

@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include "console_channel.h"
 #include "imgui.h"
 
 #include <cstdint>
@@ -23,7 +24,7 @@ namespace dragonx {
 class App;
 namespace ui {
 
-using ConsoleAddLineFn = std::function<void(const std::string&, ImU32)>;
+using ConsoleAddLineFn = std::function<void(const std::string&, ConsoleChannel)>;
 
 struct ConsoleStatusLine {
     std::string text;