feat: 完成所有页面功能和用户认证系统

✨ 新增功能:
- Work 和 News 页面实现筛选功能
- Contact 页面联系表单提交功能（加载状态、成功/失败反馈）
- Newsletter 订阅功能（邮箱验证、状态反馈）
- 移动端汉堡菜单功能（全屏菜单、动画效果）
- 用户登录/注册系统（支持账号/邮箱/手机号三合一）
- 用户状态管理（Pinia store + localStorage 持久化）
- 登录和注册弹窗组件（表单验证、错误提示）
- 用户头像和下拉菜单（桌面端和移动端）

🎨 优化改进:
- Footer 显示问题修复（多重备用机制）
- 联系信息更新（邮箱改为 chenchun@virtheart.com，手机改为微信）
- 完整的国际化支持（中英文双语）
- 响应式设计优化

🔧 技术实现:
- GSAP 动画系统
- 表单验证和反馈
- 状态持久化
- 自动生成用户头像

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

i18n/locales/en.json

@@ -62,5 +62,106 @@
     "copyright": "© 2026 ArcticNewOne Studio",
     "address": "Binhe West Road, Qixingguan District, Bijie City, Guizhou Province",
     "wechat": "WeChat"
+  },
+  "work": {
+    "title": "Our Work",
+    "description": "Explore our portfolio of creative projects and digital experiences that drive results.",
+    "categories": {
+      "all": "All",
+      "webDesign": "Web Design",
+      "branding": "Branding",
+      "development": "Development"
+    },
+    "cta": "View Project"
+  },
+  "studio": {
+    "title": "About Studio",
+    "description": "We are a creative studio focused on crafting meaningful digital experiences.",
+    "mission": {
+      "title": "Our Mission",
+      "content": "To create exceptional digital experiences that inspire, engage, and deliver measurable results for our clients."
+    },
+    "values": {
+      "title": "Core Values",
+      "creativity": "Creativity",
+      "creativityDesc": "Innovation and original thinking in every project.",
+      "quality": "Quality",
+      "qualityDesc": "Commitment to excellence in design and development.",
+      "collaboration": "Collaboration",
+      "collaborationDesc": "Partnership with clients to achieve shared goals.",
+      "integrity": "Integrity",
+      "integrityDesc": "Honest communication and transparent processes."
+    },
+    "team": {
+      "title": "Our Team",
+      "description": "A diverse group of talented designers, developers, and strategists."
+    }
+  },
+  "contact": {
+    "title": "Get In Touch",
+    "description": "Ready to start your next project? Let's talk about how we can help bring your vision to life.",
+    "form": {
+      "name": "Your Name",
+      "email": "Email Address",
+      "subject": "Subject",
+      "message": "Your Message",
+      "send": "Send Message",
+      "sending": "Sending...",
+      "sent": "Sent!",
+      "retry": "Try Again",
+      "successMessage": "Message sent successfully! We will get back to you soon.",
+      "errorMessage": "Failed to send message. Please try again or contact us directly."
+    },
+    "info": {
+      "email": "chenchun{'@'}virtheart.com",
+      "wechat": "WeChat",
+      "wechatId": "LucskyNew",
+      "address": "Binhe West Road, Qixingguan District\nBijie City, Guizhou Province",
+      "social": "Follow Us"
+    }
+  },
+  "news": {
+    "title": "News & Updates",
+    "description": "Stay informed with our latest insights, project updates, and industry trends.",
+    "readMore": "Read More",
+    "categories": {
+      "all": "All Posts",
+      "insights": "Insights",
+      "projects": "Projects",
+      "announcements": "Announcements"
+    }
+  },
+  "auth": {
+    "login": "Login",
+    "logout": "Logout",
+    "loginDescription": "Welcome back! Please login to your account.",
+    "account": "Account",
+    "accountPlaceholder": "Username / Email / Phone",
+    "password": "Password",
+    "passwordPlaceholder": "Enter your password",
+    "loginButton": "Login",
+    "loggingIn": "Logging in...",
+    "loginError": "Login failed. Please check your credentials.",
+    "demoHint": "Demo: Use any account and password to login",
+    "noAccount": "Don't have an account?",
+    "createAccount": "Sign Up",
+    "register": "Sign Up",
+    "registerDescription": "Create your account to get started.",
+    "username": "Username",
+    "usernamePlaceholder": "Enter your username",
+    "email": "Email",
+    "emailPlaceholder": "Enter your email address",
+    "phone": "Phone",
+    "phonePlaceholder": "Enter your phone (optional)",
+    "confirmPassword": "Confirm Password",
+    "confirmPasswordPlaceholder": "Enter your password again",
+    "registerButton": "Sign Up",
+    "registering": "Signing up...",
+    "registerError": "Registration failed. Please try again.",
+    "registerSuccess": "Registration successful! Logging you in...",
+    "passwordMismatch": "Passwords do not match",
+    "invalidPhone": "Invalid phone number format",
+    "alreadyHaveAccount": "Already have an account?",
+    "backToLogin": "Back to Login"
   }
 }