chatgui: create group, unified logging, fix uasync_post epoll bug

- Add CreateGroupDialog with group name input
- Generate X25519+Ed25519 keypairs, random uint64 channel_id,
  Ed25519 signature, write to DB via uasync thread
- chat_core_create_channel(): create msg table, topo_node_sqlite_channel_put()
- GUI_EVT_CHANNEL_UPDATED notification to reload channel list
- Per-category debug config: debug_level= + debug_categories= in [gui]
- Unified logging via debug_config: all threads write to same file/console
- debug_enable_console(1) to mirror file output to stderr
- DEBUG_LEVEL_DISABLED=-1: truly disable category, NONE=0 fallback to global
- Fix uasync_post under epoll: process_posted_tasks was never called
- Fix MainWindow constructor parameter ordering (dbPath vs debugFile)
- debug_ui.h: append mode ('a' instead of 'w')

tools/chatgui/src/main.cpp

@@ -5,7 +5,6 @@
 #include "mainwindow.h"
 #include "../db/db_manager.h"
 #include "../transport/node_config.h"
-#include "debug_ui.h"
 
 int main(int argc, char *argv[]) {
     QApplication app(argc, argv);
@@ -55,16 +54,14 @@ int main(int argc, char *argv[]) {
             cfg.save();
     }
 
-    if (!cfg.debugFile().isEmpty())
-        guiDebugFile(cfg.debugFile().toUtf8().constData());
-
     QString dbPath = cfg.dbPath();
     if (dbPath.isEmpty()) dbPath = "chats.db";
     if (!QDir::isAbsolutePath(dbPath))
         dbPath = QCoreApplication::applicationDirPath() + "/" + dbPath;
 
     DbManager db(dbPath);
-    MainWindow w(nullptr, &db, cfgPath, cfg.debugFile());
+    MainWindow w(nullptr, &db, cfgPath, dbPath, cfg.debugFile(),
+                 cfg.debugLevel(), cfg.debugCategories());
     w.show();
 
     return app.exec();