feat(mcp): add server toggles in marketplace

[musnows]

中文

变更

• 在 MCP 管理面板的个人 MCP 服务卡片上增加启用/禁用按钮。
• 切换时保留原有 server 配置，仅写回 enabled 字段，并兼容顶层 servers 和 capabilities.mcp.servers 两种 JSON 结构。
• 为禁用状态补充中英文文案和配置 helper 单测。

验证

• npm test -- --run src/renderer/src/components/PluginMarketplaceView.test.ts src/renderer/src/components/plugin-marketplace-runtime.test.ts
• npm run typecheck
• npm run build

English

Changes

• Added enable/disable actions to personal MCP server cards in the MCP marketplace.
• Preserved existing server config while toggling only the enabled field, with support for both top-level servers and nested capabilities.mcp.servers JSON shapes.
• Added localized labels and focused tests for the MCP config helper.

Validation

• npm test -- --run src/renderer/src/components/PluginMarketplaceView.test.ts src/renderer/src/components/plugin-marketplace-runtime.test.ts
• npm run typecheck
• npm run build