fix: remove standard imap extension for Debian Trixie

The libc-client-dev package required for the standard PHP imap extension
has been removed from Debian Trixie (Debian 13). This causes build
failures for PHP 8.1, 8.2, and 8.3 on Trixie.

Changes:
- Remove 8.1/trixie/imap, 8.2/trixie/imap, 8.3/trixie/imap directories
- Update README.md to mark standard imap as unsupported (✗) for all Trixie versions
- Keep pecl_imap extension which still works on Trixie as an alternative

The standard imap extension remains available on Alpine and was already
unsupported on PHP 8.4+ where it was removed from PHP core.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: fox91

8.1/trixie/imap/Dockerfile

@@ -32,7 +32,7 @@ Extension | PHP `8.1` `trixie` | PHP `8.1` `alpine3.22` | PHP `8.2` `trixie` | P
 [`igbinary`](https://pecl.php.net/package/igbinary) _PECL_ | `(3.2.16)` [:whale:](8.1/trixie/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.1/alpine3.22/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.2/trixie/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.2/alpine3.22/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.3/trixie/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.3/alpine3.22/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.4/trixie/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.4/alpine3.22/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.5/trixie/pecl_igbinary/Dockerfile) | `(3.2.16)` [:whale:](8.5/alpine3.22/pecl_igbinary/Dockerfile)
 [`imagick`](https://pecl.php.net/package/imagick) _PECL_ | `(3.8.0)` [:whale:](8.1/trixie/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.1/alpine3.22/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.2/trixie/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.2/alpine3.22/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.3/trixie/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.3/alpine3.22/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.4/trixie/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.4/alpine3.22/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.5/trixie/pecl_imagick/Dockerfile) | `(3.8.0)` [:whale:](8.5/alpine3.22/pecl_imagick/Dockerfile)
 [`imap`](https://pecl.php.net/package/imap) _PECL_ | `(1.0.3)` [:whale:](8.1/trixie/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.1/alpine3.22/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.2/trixie/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.2/alpine3.22/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.3/trixie/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.3/alpine3.22/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.4/trixie/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.4/alpine3.22/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.5/trixie/pecl_imap/Dockerfile) | `(1.0.3)` [:whale:](8.5/alpine3.22/pecl_imap/Dockerfile)
-[`imap`](https://php.net/imap) | [:whale:](8.1/trixie/imap/Dockerfile) | [:whale:](8.1/alpine3.22/imap/Dockerfile) | [:whale:](8.2/trixie/imap/Dockerfile) | [:whale:](8.2/alpine3.22/imap/Dockerfile) | [:whale:](8.3/trixie/imap/Dockerfile) | [:whale:](8.3/alpine3.22/imap/Dockerfile) | ✗ | ✗ | ✗ | ✗
+[`imap`](https://php.net/imap) | ✗ | [:whale:](8.1/alpine3.22/imap/Dockerfile) | ✗ | [:whale:](8.2/alpine3.22/imap/Dockerfile) | ✗ | [:whale:](8.3/alpine3.22/imap/Dockerfile) | ✗ | ✗ | ✗ | ✗
 [`intl`](https://php.net/intl) | [:whale:](8.1/trixie/intl/Dockerfile) | [:whale:](8.1/alpine3.22/intl/Dockerfile) | [:whale:](8.2/trixie/intl/Dockerfile) | [:whale:](8.2/alpine3.22/intl/Dockerfile) | [:whale:](8.3/trixie/intl/Dockerfile) | [:whale:](8.3/alpine3.22/intl/Dockerfile) | [:whale:](8.4/trixie/intl/Dockerfile) | [:whale:](8.4/alpine3.22/intl/Dockerfile) | [:whale:](8.5/trixie/intl/Dockerfile) | [:whale:](8.5/alpine3.22/intl/Dockerfile)
 [`ldap`](https://php.net/ldap) | [:whale:](8.1/trixie/ldap/Dockerfile) | [:whale:](8.1/alpine3.22/ldap/Dockerfile) | [:whale:](8.2/trixie/ldap/Dockerfile) | [:whale:](8.2/alpine3.22/ldap/Dockerfile) | [:whale:](8.3/trixie/ldap/Dockerfile) | [:whale:](8.3/alpine3.22/ldap/Dockerfile) | [:whale:](8.4/trixie/ldap/Dockerfile) | [:whale:](8.4/alpine3.22/ldap/Dockerfile) | [:whale:](8.5/trixie/ldap/Dockerfile) | [:whale:](8.5/alpine3.22/ldap/Dockerfile)
 [`mailparse`](https://pecl.php.net/package/mailparse) _PECL_ | `(3.1.9)` [:whale:](8.1/trixie/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.1/alpine3.22/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.2/trixie/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.2/alpine3.22/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.3/trixie/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.3/alpine3.22/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.4/trixie/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.4/alpine3.22/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.5/trixie/pecl_mailparse/Dockerfile) | `(3.1.9)` [:whale:](8.5/alpine3.22/pecl_mailparse/Dockerfile)