[Billing for self hosts] Add info in description (#22660)

Clarify how the same enterprise key is reused for one prod + one dev
instance.
Suggest to save / store enterprise key in clear somewhere.

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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

packages/twenty-front/src/pages/settings/enterprise/SettingsEnterprise.tsx

@@ -510,7 +510,7 @@ export const SettingsEnterprise = ({
     <Section>
       <H2Title
         title={t`Activate Enterprise Key`}
-        description={t`Paste your enterprise key below to activate`}
+        description={t`Paste your enterprise key below to activate. Keep a copy of this key somewhere safe: the same key is reused to set up a development instance or to move your license to a replacement server.`}
       />
       <StyledInputContainer>
         <StyledInputWrapper>
@@ -559,14 +559,23 @@ export const SettingsEnterprise = ({
     </Section>
   );
 
+  const enterpriseKeyInfoSection = (
+    <Section>
+      <H2Title
+        title={t`Your enterprise key`}
+        description={t`This server has an enterprise key configured. Make sure you keep a copy of it somewhere safe: you need the same key to activate a development instance or to move your license to a replacement server. If you no longer have access to your key, contact support.`}
+      />
+    </Section>
+  );
+
   const instanceTypeSection = (
     <Section>
       <H2Title
         title={t`Development instance`}
         description={
           instanceType === ENTERPRISE_INSTANCE_TYPE.DEVELOPMENT
-            ? t`This instance is registered as a development instance and is not billed. A subscription can have a single free development instance in addition to its production one.`
-            : t`Register this server as a free development instance (for a staging or test environment). Development instances unlock enterprise features without being billed, and do not affect your production seat count.`
+            ? t`This server is registered as a development instance and is not billed additionally. A subscription can have a single development instance in addition to its production one. Switching it back to a production instance will make its seats count toward billing.`
+            : t`One subscription provides one enterprise key that powers one production instance and one potential staging or test instance. To run a staging or test environment, install Twenty on a second server, activate it with this same enterprise key, then register that server as a development instance. Development instances unlock enterprise features without extra billing and do not count toward your production seats.`
         }
       />
       {instanceType === ENTERPRISE_INSTANCE_TYPE.DEVELOPMENT ? (
@@ -955,6 +964,7 @@ export const SettingsEnterprise = ({
         onConfirmClick={handleReleaseBinding}
       />
       {renderContent()}
+      {hasSignedEnterpriseKey && enterpriseKeyInfoSection}
       {hasEnterpriseLicense && instanceTypeSection}
     </>
   );