Add UDP broadcast and Qt6 discovery functionality

- Add UDP broadcast component that sends server info every 30 seconds
- Create Qt6 discovery application for LAN server detection
- Fix Migration 012 column count mismatch by adding missing status column
- Suppress Chromium sandbox warnings when running as root
- Add PyInstaller specs for Linux and Windows executables
- Update requirements.txt with netifaces dependency
- Create comprehensive documentation and setup scripts

Features:
- Automatic server discovery on local network
- Cross-platform support (Linux/Windows)
- System tray integration
- Auto-open browser functionality
- SSL detection and support
- Standalone executable builds

mbetterclient/database/migrations.py

@@ -658,6 +658,15 @@ class Migration_012_RemoveFixtureIdUniqueConstraint(DatabaseMigration):
         """Remove UNIQUE constraint from fixture_id column"""
         try:
             with db_manager.engine.connect() as conn:
+                # Debug: Check actual column count and names
+                result = conn.execute(text("PRAGMA table_info(matches)"))
+                old_columns = result.fetchall()
+                logger.info(f"Old matches table has {len(old_columns)} columns: {[col[1] for col in old_columns]}")
+
+                # Log each column with details
+                for col in old_columns:
+                    logger.info(f"Column {col[1]}: {col[2]} {'PRIMARY KEY' if col[5] else ''}")
+
                 # SQLite doesn't support ALTER TABLE DROP CONSTRAINT directly
                 # We need to recreate the table without the UNIQUE constraint
                 
@@ -675,6 +684,7 @@ class Migration_012_RemoveFixtureIdUniqueConstraint(DatabaseMigration):
                         result VARCHAR(255) NULL,
                         done BOOLEAN DEFAULT FALSE NOT NULL,
                         running BOOLEAN DEFAULT FALSE NOT NULL,
+                        status VARCHAR(20) DEFAULT 'pending' NOT NULL,
                         fixture_active_time INTEGER NULL,
 
                         filename VARCHAR(1024) NOT NULL,

mbetterclient/qt_player/qt6_player.py

@@ -170,6 +170,12 @@ class OverlayWebView(QWebEngineView):
         self.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, True)
         self.setAttribute(Qt.WidgetAttribute.WA_TransparentForMouseEvents, True)
 
+        # Suppress Chromium sandbox warnings when running as root
+        import os
+        if os.geteuid() == 0:  # Running as root
+            os.environ['QTWEBENGINE_DISABLE_SANDBOX'] = '1'
+            logger.info("Disabled Qt WebEngine sandbox for root user")
+
         # Configure page settings
         page = self.page()
         page.setBackgroundColor(QColor(0, 0, 0, 0))  # Transparent background