[Bug] "Import All" button in MCP Server setup imports single tool instead of all tools

[yanniszhou]

Location: `frontend/src/pages/EnterpriseSettings.tsx` line ~1263–1292

Describe the bug

In Enterprise Settings → Tools → Add MCP Server, after testing a connection, the tool list is displayed with one "Import All" (`导入全部`) button per tool row. However:

1. The button label says "Import All" but clicking it only imports the single tool on that row, not all tools.
2. The "Import All" button is rendered inside a `.map()` loop, resulting in N identical-looking buttons for N tools — which is confusing and misleading.

Expected behavior

• Each tool row should have an "Import" button (imports that single tool)
• A single "Import All" button should appear outside the loop (below the tool list), which imports all discovered tools at once

Steps to reproduce

1. Go to Enterprise Settings → Tools tab
2. Click "+ Add MCP Server"
3. Enter a valid MCP server URL and click "Test Connection"
4. Observe that each tool row has a button labeled "Import All"

Code reference

// Line 1263 — button is inside .map(), but labeled "Import All"
{(mcpTestResult.tools || []).map((tool: any, i: number) => (
    <div key={i} ...>
        <span>{tool.name}</span>
        <button onClick={/* imports only this one tool */}>
            {t('enterprise.tools.importAll')}  {/* ← misleading label */}
        </button>
    </div>
))}

Suggested fix

• Rename the per-row button label to t('enterprise.tools.import') (single tool import)
• Add a new "Import All" button outside the `.map()` loop that iterates over all tools and calls `POST /api/tools` for each one