fix: improve MCP page setup UX and remove automation credit quotas (#821)

* Remove MCP credit quotas and improve MCP setup page

- Always show client setup snippets with placeholder keys
- Add View Docs link to MCP page header
- Remove monthly automation credit enforcement and UI
- Update plan feature text to reflect free MCP access

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix: address PR review feedback for MCP page changes

- Clear generatedSecret when revoking MCP keys
- Use Button link mode for View Docs with rel noopener noreferrer
- Update all dashboard locale files for MCP translations
- Make MCP rate-limit admission atomic with transactional reservations
- Wrap MCP route handlers with withMcpAutomationUsage helper

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* revert: remove atomic MCP rate-limit reservations

The transactional advisory-lock reservation was unnecessary complexity
for our MCP usage model. Restore the simpler check-then-record flow.

Also only clear generatedSecret when revoking the key it belongs to.

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix: address remaining MCP page bot review feedback

- Add blank lines after confirm guards in key handlers
- Skip showing rotated secret if key was revoked during rotation
- Fix vi keys_title and de rate_limits_title translations

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix: prevent late key rotation from un-revoking or exposing secrets

- Rotate only when revoked_at IS NULL at update time (DB)
- Reject rotate requests for already-revoked keys (API)
- Ignore stale rotate responses in automation client state
- Guard MCP UI against showing secrets for revoked keys

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

---------

apps/dashboard/src/routes/(app)/org/[slug]/mcp/+page.svelte

@@ -3,6 +3,8 @@
   import { automationApi } from '$features/automation/api/automation.svelte';
   import { t } from '$lib/utils/functions/translations';
   import * as Page from '@cio/ui/base/page';
+  import { Button } from '@cio/ui/base/button';
+  import ArrowUpRightIcon from '@lucide/svelte/icons/arrow-up-right';
 
   let { data } = $props();
 
@@ -24,6 +26,17 @@
       <Page.Title>{$t('automation.tabs.mcp')}</Page.Title>
       <Page.Subtitle>{$t('automation.mcp.page_subtitle')}</Page.Subtitle>
     </Page.HeaderContent>
+    <Page.Action>
+      <Button
+        variant="outline"
+        href="https://classroomio.com/docs/mcp"
+        target="_blank"
+        rel="noopener noreferrer"
+      >
+        <ArrowUpRightIcon size={16} />
+        {$t('automation.mcp.view_docs')}
+      </Button>
+    </Page.Action>
   </Page.Header>
 
   <Page.Body>