fix(mcp): update MCP wizard to support http type and improve args input

- Replace deprecated 'sse' type with 'http' (as per Claude Code official docs)
- Add HTTP-specific fields: url (required) and headers (optional)
- Implement dynamic UI: show different fields based on selected type
- Improve args input: support multi-line input (one argument per line)
- Add headers parsing supporting both 'KEY: VALUE' and 'KEY=VALUE' formats
- Update backend validation to enforce type-specific required fields
- Update i18n translations (zh/en) with new HTTP-related labels

src/i18n/locales/en.json

@@ -280,12 +280,17 @@
       "type": "Type",
       "command": "Command",
       "commandPlaceholder": "uvx",
-      "args": "Arguments",
-      "argsPlaceholder": "mcp-server-fetch",
+      "args": "Arguments (one per line)",
+      "argsPlaceholder": "mcp-server-fetch\n--config config.json",
       "cwd": "Working Directory",
       "cwdPlaceholder": "/path/to/project",
       "env": "Environment Variables",
       "envPlaceholder": "KEY=VALUE\n(one per line)",
+      "url": "URL",
+      "urlPlaceholder": "https://api.example.com/mcp",
+      "urlRequired": "Please enter URL",
+      "headers": "Headers (optional)",
+      "headersPlaceholder": "Authorization: Bearer token\nContent-Type: application/json",
       "preview": "Configuration Preview",
       "apply": "Apply Configuration"
     },

src/i18n/locales/zh.json

@@ -280,12 +280,17 @@
       "type": "类型",
       "command": "命令",
       "commandPlaceholder": "uvx",
-      "args": "参数",
-      "argsPlaceholder": "mcp-server-fetch",
+      "args": "参数（每行一个）",
+      "argsPlaceholder": "mcp-server-fetch\n--config config.json",
       "cwd": "工作目录",
       "cwdPlaceholder": "/path/to/project",
       "env": "环境变量",
       "envPlaceholder": "KEY=VALUE\n(一行一个)",
+      "url": "URL",
+      "urlPlaceholder": "https://api.example.com/mcp",
+      "urlRequired": "请输入 URL",
+      "headers": "请求头（可选）",
+      "headersPlaceholder": "Authorization: Bearer token\nContent-Type: application/json",
       "preview": "配置预览",
       "apply": "应用配置"
     },