Fix template resource config filename and item uriTemplate

[curler7]

[BC] Rename Template resource config file and unify shop template item URI

Description

This PR introduces two changes to the CMS Template shop API resource configuration:

1. Renames the incorrectly named file:

   • Tempalate.xml → Template.xml

2. Updates the item operation uriTemplate from:

   • /shop/cms/template/{id}
     to:
   • /shop/cms/templates/{id}

The goal is to align the item endpoint with the collection endpoint:

• Collection: /shop/cms/templates
• Item (after change): /shop/cms/templates/{id}

Rationale

• The filename currently contains a typo.
• The item endpoint uses a singular form (template) while the collection uses a plural form (templates).
• This change makes the API structure consistent and predictable.

⚠️ Backward Compatibility

This change modifies a public API endpoint:
/shop/cms/template/{id}

is replaced by:
/shop/cms/templates/{id}

If the singular endpoint is already used in production integrations, this constitutes a backward compatibility break.

Please advise whether:

• This should target a major version only, or
• A deprecation path should be introduced instead.

How to verify

1. Install CmsPlugin in a Sylius project.
2. Clear cache.
3. Run:
   bin/console debug:router | grep cms

Expected output includes:
/shop/cms/templates
/shop/cms/templates/{id}

4. Ensure API Platform metadata loads without errors.

Checklist

• XML is valid
• No duplicate route definitions
• Follows API Platform metadata structure
• BC impact documented

[crydotsnake]

I would suggest adding this to the next major version (1.2). Same as #123 - this contains also a BC change.