fix(core): nested numbered list order (#14764)

## The Fix ##
Fixes #13396. The issue happened because 'doc.getPrev(model)' returns
previous node based in document order instead of previous sibling within
list level. This caused nested list items to inherit the numbering from
their parent rather than restarting. The fix ensures that numbering is
calculated relative to correct list context.

## Video Demonstration ##
### Before ###

https://github.com/user-attachments/assets/9523209a-93d9-4984-aa9e-149ac1941036

### After ###

https://github.com/user-attachments/assets/ff28b166-3572-4536-9893-0ab5c05c8d9f






<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
  * Enhanced numbered list ordering logic for improved list handling.

* **Chores**
* Updated environment configuration template with active sample values
for database connectivity, caching services, AI integrations, and email
delivery settings.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/list/src/commands/utils.ts

@@ -30,7 +30,11 @@ export function correctNumberedListsOrderToPrev(
 
   const fn = () => {
     // step 1
-    const previousSibling = doc.getPrev(model);
+    const parent = doc.getParent(model);
+    if (!parent) return;
+    const index = parent.children.indexOf(model);
+    const previousSibling = index > 0 ? parent.children[index - 1] : null;
+
     if (
       previousSibling &&
       matchModels(previousSibling, [ListBlockModel]) &&