- Add GET /api/mcp/servers (list with masked secrets)
- Add PUT /api/mcp/servers/<name> (add/update stdio and http servers)
- Add DELETE /api/mcp/servers/<name> (remove server)
- MCP section in System settings with server list, add/delete form
- Auto-detect transport type (stdio vs http) from server config
- Mask sensitive values (API keys, tokens, passwords) in list response
- Uses showConfirmDialog for delete confirmation (no native confirm)
- i18n: 21 keys across 7 locales
- 21 tests (list, save, delete, mask_secrets, validation)
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