feat: add logging module for backend + frontend error reporting

Backend:
- New Logger utility (app/utils/Logger.php) with category-based log files
  (connect/game/bet/error/frontend under runtime/log/)
- Log WebSocket connect/close events (WsConnect, WsClose)
- Log dealer auth success/failure (SpaceConnectService)
- Log all game events: startBet, endBet, changeBoot, opening for all 7 game types
- Log unhandled exceptions (ExceptionHandle)
- Separate SQL/error logs via apart_level, enable realtime_write for Swoole
- Add /log/report POST endpoint for frontend error ingestion

Frontend:
- New error-report.js with window.onerror + unhandledrejection auto-reporting
- Added to all 12 dealer HTML templates
- Bump VERSION_V to v10.1.0

app/utils/Logger.php

@@ -0,0 +1,40 @@
+<?php
+namespace app\utils;
+
+class Logger
+{
+    const CAT_CONNECT  = 'connect';
+    const CAT_GAME     = 'game';
+    const CAT_BET      = 'bet';
+    const CAT_ERROR    = 'error';
+    const CAT_FRONTEND = 'frontend';
+
+    public static function log(string $category, string $level, string $message, array $context = []): void
+    {
+        $date = date('Y-m-d');
+        $time = date('Y-m-d H:i:s');
+        $dir = runtime_path() . 'log' . DIRECTORY_SEPARATOR . $category;
+        if (!is_dir($dir)) {
+            mkdir($dir, 0755, true);
+        }
+        $file = $dir . DIRECTORY_SEPARATOR . $date . '.log';
+        $contextStr = $context ? ' ' . json_encode($context, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) : '';
+        $line = "[{$time}][{$level}] {$message}{$contextStr}" . PHP_EOL;
+        file_put_contents($file, $line, FILE_APPEND | LOCK_EX);
+    }
+
+    public static function info(string $category, string $message, array $context = []): void
+    {
+        self::log($category, 'INFO', $message, $context);
+    }
+
+    public static function warn(string $category, string $message, array $context = []): void
+    {
+        self::log($category, 'WARN', $message, $context);
+    }
+
+    public static function error(string $category, string $message, array $context = []): void
+    {
+        self::log($category, 'ERROR', $message, $context);
+    }
+}