Complete the v3.7.0 MCP refactoring by updating the form layer to match
the unified architecture already implemented in data/service/API layers.
**Breaking Changes:**
- Remove confusing `appId` parameter from McpFormModal
- Replace with `defaultFormat` (json/toml) and `defaultEnabledApps` (array)
**Form Enhancements:**
- Add app enablement checkboxes (Claude/Codex/Gemini) directly in the form
- Smart defaults: new servers default to Claude enabled, editing preserves state
- Support "draft" mode: servers can be created without enabling any apps
**Architecture Improvements:**
- Eliminate semantic confusion: format selection separate from app targeting
- One-step workflow: configure and enable apps in single form submission
- Consistent with unified backend: `apps: { claude, codex, gemini }`
**Testing:**
- Update test mocks to use `useUpsertMcpServer` hook
- Add test case for creating servers with no apps enabled
- Fix parameter references from `appId` to `defaultFormat`
**i18n:**
- Add `mcp.form.enabledApps` translation (zh/en)
- Add `mcp.form.noAppsWarning` translation (zh/en)
This completes the MCP management refactoring, ensuring all layers
(data, service, API, UI) follow the same unified architecture pattern.
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