Add SureForms integration

[closetechbot]

Summary

• Adds a FORMSCRM_SureForms integration class that registers a FormsCRM metabox on the SureForms form editor (sureforms_form post type) with CRM type, credentials, module selection and field mapping.
• Processes entries by hooking into the srfm_form_submit action fired after a successful SureForms submission, and calls create_entry() on the configured CRM.
• Settings are stored per-form as post meta (_formscrm_sureforms_settings); mapped fields are matched by label, since that's how SureForms keys the submission data passed to srfm_form_submit.
• CRM failures are caught and logged via formscrm_alert_error() — form submissions are never blocked.
• The integration only loads when SureForms is active (is_plugin_active( 'sureforms/sureforms.php' )), following the same conditional-loading pattern as the other form integrations (CF7, JetFormBuilder, WPForms, etc.).

To confirm the exact hook name, the sureforms_form post type slug, and the label-keyed shape of the data passed to srfm_form_submit, I cloned and read the public SureForms source (brainstormforce/sureforms-public) rather than guessing.

Changes

• includes/formscrm-library/class-sureforms.php (new): the integration class.
• includes/formscrm-library/loader.php: conditionally requires the new class.
• tests/Forms/test-sureforms.php (new) + tests/bootstrap.php: unit tests for get_merge_vars() (field mapping, literal fallback, array values).
• readme.txt / formscrm.php: SureForms added to the supported plugins list, version bumped 4.4.3 → 4.5.0, changelog entry added.

Closes #292

Test plan

• composer lint (WordPress Coding Standards via PHPCS)
• composer phpstan
• composer test (PHPUnit, including the new SureFormsTest)
• Manual: install SureForms, build a form, configure the FormsCRM metabox (CRM type, credentials, module, field mapping), submit the form, and confirm the entry is created in the CRM.
• Manual: submit with invalid CRM credentials and confirm the error is logged in FormsCRM's Error Log without blocking the form submission.

Note: I could not run composer lint / composer phpstan / composer test locally in my sandbox — composer install fails there due to network restrictions reaching the GitHub API (no token configured), unrelated to this change. I verified syntax with php -l and manually checked indentation/alignment/Yoda-conditions against the existing class-contactform7.php convention. CI should confirm.

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