feat: 实现联系表单提交与邮件通知功能

添加联系表单提交接口和邮件通知功能，支持从环境变量读取 SMTP 配置
重构 SEO 配置到 site.json，新增 robots.txt 和 sitemap.xml 生成
更新公司电话并添加 PM2 生产运行配置

pnpm-lock.yaml

@@ -125,6 +125,9 @@ importers:
       next-themes:
         specifier: ^0.4.6
         version: 0.4.6(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      nodemailer:
+        specifier: ^8.0.2
+        version: 8.0.2
       react:
         specifier: 19.2.4
         version: 19.2.4
@@ -152,6 +155,9 @@ importers:
       vaul:
         specifier: ^1.1.2
         version: 1.1.2(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      yaml:
+        specifier: ^2.8.2
+        version: 2.8.2
       zod:
         specifier: ^3.24.1
         version: 3.25.76
@@ -162,6 +168,9 @@ importers:
       '@types/node':
         specifier: ^22
         version: 22.19.11
+      '@types/nodemailer':
+        specifier: ^7.0.11
+        version: 7.0.11
       '@types/react':
         specifier: 19.2.14
         version: 19.2.14
@@ -1222,6 +1231,9 @@ packages:
   '@types/node@22.19.11':
     resolution: {integrity: sha512-BH7YwL6rA93ReqeQS1c4bsPpcfOmJasG+Fkr6Y59q83f9M1WcBRHR2vM+P9eOisYRcN3ujQoiZY8uk5W+1WL8w==}
 
+  '@types/nodemailer@7.0.11':
+    resolution: {integrity: sha512-E+U4RzR2dKrx+u3N4DlsmLaDC6mMZOM/TPROxA0UAPiTgI0y4CEFBmZE+coGWTjakDriRsXG368lNk1u9Q0a2g==}
+
   '@types/react-dom@19.2.3':
     resolution: {integrity: sha512-jp2L/eY6fn+KgVVQAOqYItbF0VY/YApe5Mz2F0aykSO8gx31bYCZyvSeYxCHKvzHG5eZjc+zyaS5BrBWya2+kQ==}
     peerDependencies:
@@ -1543,6 +1555,10 @@ packages:
   node-releases@2.0.27:
     resolution: {integrity: sha512-nmh3lCkYZ3grZvqcCH+fjmQ7X+H0OeZgP40OierEaAptX4XofMh5kwNbWh7lBduUzCcV/8kZ+NDLCwm2iorIlA==}
 
+  nodemailer@8.0.2:
+    resolution: {integrity: sha512-zbj002pZAIkWQFxyAaqoxvn+zoIwRnS40hgjqTXudKOOJkiFFgBeNqjgD3/YCR12sZnrghWYBY+yP1ZucdDRpw==}
+    engines: {node: '>=6.0.0'}
+
   object-assign@4.1.1:
     resolution: {integrity: sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==}
     engines: {node: '>=0.10.0'}
@@ -1751,6 +1767,11 @@ packages:
   victory-vendor@36.9.2:
     resolution: {integrity: sha512-PnpQQMuxlwYdocC8fIJqVXvkeViHYzotI+NJrCuav0ZYFoq912ZHBk3mCeuj+5/VpodOjPe1z0Fk2ihgzlXqjQ==}
 
+  yaml@2.8.2:
+    resolution: {integrity: sha512-mplynKqc1C2hTVYxd0PU2xQAc22TI1vShAYGksCCfxbn/dFwnHTNi1bvYsBTkhdUNtGIf5xNOg938rrSSYvS9A==}
+    engines: {node: '>= 14.6'}
+    hasBin: true
+
   zod@3.25.76:
     resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
 
@@ -2726,6 +2747,10 @@ snapshots:
     dependencies:
       undici-types: 6.21.0
 
+  '@types/nodemailer@7.0.11':
+    dependencies:
+      '@types/node': 22.19.11
+
   '@types/react-dom@19.2.3(@types/react@19.2.14)':
     dependencies:
       '@types/react': 19.2.14
@@ -2977,6 +3002,8 @@ snapshots:
 
   node-releases@2.0.27: {}
 
+  nodemailer@8.0.2: {}
+
   object-assign@4.1.1: {}
 
   picocolors@1.1.1: {}
@@ -3205,4 +3232,6 @@ snapshots:
       d3-time: 3.1.0
       d3-timer: 3.0.1
 
+  yaml@2.8.2: {}
+
   zod@3.25.76: {}