Health monitor status for admin panel (#10186)

# Health Monitoring for Self-Hosted Instances

This PR implements basic health monitoring for self-hosted instances in
the admin panel.

## Service Status Checks
We're adding real-time health checks for:
- Redis Connection
- Database Connection
- Worker Status
- Message Sync Status

## Existing Functionality
We already have message sync and captcha counters that store aggregated
metrics in cache within a configurable time window (default: 5 minutes).

## New Endpoints
1. `/healthz` - Basic server health check for Kubernetes pod monitoring
2. `/healthz/{serviceName}` - Individual service health checks (returns
200 if healthy)
3. `/metricsz/{metricName}` - Time-windowed metrics (message sync,
captcha)
4. GraphQL resolver in admin panel for UI consumption

All endpoints use the same underlying service, with different
presentation layers for infrastructure and UI needs.

---------

Co-authored-by: Félix Malfait <felix@twenty.com>

packages/twenty-front/src/modules/settings/admin-panel/components/SettingsAdminGeneral.tsx

@@ -15,6 +15,7 @@ import { useRecoilState, useRecoilValue } from 'recoil';
 import { getImageAbsoluteURI, isDefined } from 'twenty-shared';
 import {
   Button,
+  GithubVersionLink,
   H1Title,
   H1TitleFontColor,
   H2Title,
@@ -24,6 +25,8 @@ import {
 import { REACT_APP_SERVER_BASE_URL } from '~/config';
 import { useUserLookupAdminPanelMutation } from '~/generated/graphql';
 
+import packageJson from '../../../../../package.json';
+
 const StyledLinkContainer = styled.div`
   margin-right: ${({ theme }) => theme.spacing(2)};
   width: 100%;
@@ -120,6 +123,11 @@ export const SettingsAdminGeneral = () => {
 
   return (
     <>
+      <Section>
+        <H2Title title="About" description="Version of the application" />
+        <GithubVersionLink version={packageJson.version} />
+      </Section>
+
       <Section>
         <H2Title
           title={
@@ -176,6 +184,7 @@ export const SettingsAdminGeneral = () => {
               behaveAsLinks={false}
             />
           </StyledTabListContainer>
+
           <StyledContentContainer>
             <SettingsAdminWorkspaceContent activeWorkspace={activeWorkspace} />
           </StyledContentContainer>