chore：完善项目目录结构和基础框架

- 添加核心系统框架目录结构
- 创建游戏模块化组织架构
- 添加数据配置和本地化支持
- 建立脚本分类管理体系
- 创建场景预制件管理目录

core/utils/StringUtils.gd

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+class_name StringUtils
+
+# 字符串工具类 - 提供常用的字符串处理功能
+
+# 验证邮箱格式
+static func is_valid_email(email: String) -> bool:
+	var regex = RegEx.new()
+	regex.compile("^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$")
+	return regex.search(email) != null
+
+# 验证用户名格式（字母、数字、下划线）
+static func is_valid_username(username: String) -> bool:
+	if username.is_empty() or username.length() > 50:
+		return false
+	
+	var regex = RegEx.new()
+	regex.compile("^[a-zA-Z0-9_]+$")
+	return regex.search(username) != null
+
+# 验证密码强度
+static func validate_password_strength(password: String) -> Dictionary:
+	var result = {"valid": false, "message": "", "strength": 0}
+	
+	if password.length() < 8:
+		result.message = "密码长度至少8位"
+		return result
+	
+	if password.length() > 128:
+		result.message = "密码长度不能超过128位"
+		return result
+	
+	var has_letter = false
+	var has_digit = false
+	var has_special = false
+	
+	for i in range(password.length()):
+		var char = password[i]
+		if char >= 'a' and char <= 'z' or char >= 'A' and char <= 'Z':
+			has_letter = true
+		elif char >= '0' and char <= '9':
+			has_digit = true
+		elif char in "!@#$%^&*()_+-=[]{}|;:,.<>?":
+			has_special = true
+	
+	var strength = 0
+	if has_letter:
+		strength += 1
+	if has_digit:
+		strength += 1
+	if has_special:
+		strength += 1
+	if password.length() >= 12:
+		strength += 1
+	
+	result.strength = strength
+	
+	if not (has_letter and has_digit):
+		result.message = "密码必须包含字母和数字"
+		return result
+	
+	result.valid = true
+	result.message = "密码强度: " + ["弱", "中", "强", "很强"][min(strength - 1, 3)]
+	return result
+
+# 截断字符串
+static func truncate(text: String, max_length: int, suffix: String = "...") -> String:
+	if text.length() <= max_length:
+		return text
+	return text.substr(0, max_length - suffix.length()) + suffix
+
+# 首字母大写
+static func capitalize_first(text: String) -> String:
+	if text.is_empty():
+		return text
+	return text[0].to_upper() + text.substr(1)
+
+# 转换为标题格式（每个单词首字母大写）
+static func to_title_case(text: String) -> String:
+	var words = text.split(" ")
+	var result = []
+	for word in words:
+		if not word.is_empty():
+			result.append(capitalize_first(word.to_lower()))
+	return " ".join(result)
+
+# 移除HTML标签
+static func strip_html_tags(html: String) -> String:
+	var regex = RegEx.new()
+	regex.compile("<[^>]*>")
+	return regex.sub(html, "", true)
+
+# 格式化文件大小
+static func format_file_size(bytes: int) -> String:
+	var units = ["B", "KB", "MB", "GB", "TB"]
+	var size = float(bytes)
+	var unit_index = 0
+	
+	while size >= 1024.0 and unit_index < units.size() - 1:
+		size /= 1024.0
+		unit_index += 1
+	
+	if unit_index == 0:
+		return str(int(size)) + " " + units[unit_index]
+	else:
+		return "%.1f %s" % [size, units[unit_index]]