Cleanup: inline coursemodule_standard_elements, merge event_observer into observer

[Copilot]

The implementation had unnecessary indirection through a hook_listener class (no Moodle hook exists for module form injection) and split event handling across two observer classes with no meaningful distinction.

Changes

• lib.php — Form logic inlined directly into block_exaport_coursemodule_standard_elements(); no longer delegates to the removed hook_listener class
• classes/observer.php — course_module_created() and course_module_updated() merged in from the now-deleted event_observer.php; all event handling lives in one place
• db/events.php — Course module event callbacks updated to reference \block_exaport\observer instead of \block_exaport\event_observer

Deleted

File	Reason
classes/hook_listener.php	Unnecessary wrapper; logic now lives directly in lib.php
classes/event_observer.php	No reason to split from observer.php; same namespace, same pattern
db/hooks.php	Was entirely empty ($callbacks = [])

Original prompt

Objective

Implement a modern Moodle 5 hook callback to extend the assignment activity settings page with a dropdown field. This should be done in a Moodle-conform way using the hooks API.

Requirements

1. Create Hook Listener Class

Create blocks/exaport/classes/hook_listener.php with:

• A static method that handles the \core\hook\form_coursemodule_standard_elements hook
• Only apply to assignment activities (check $hook->get_cmtype() === 'assign')
• Add a dropdown (select element) with the following options:
  • testvalue1
  • testvalue2
  • testvalue3
• Field name should be: block_exaport_assignment_option
• Use proper namespace: block_exaport\hook_listener

2. Register Hook

Create blocks/exaport/db/hooks.php to register the hook callback:

• Follow Moodle 5 hooks registration format
• Register the \core\hook\form_coursemodule_standard_elements hook

3. Add Language Strings

Add to blocks/exaport/lang/en/block_exaport.php (or create if needed):

• $string['assignment_option'] = 'Exaport Assignment Option';
• $string['testvalue1'] = 'Test Value 1';
• $string['testvalue2'] = 'Test Value 2';
• $string['testvalue3'] = 'Test Value 3';

4. Add Placeholder Event Observers (for future development)

Create blocks/exaport/classes/event_observer.php with placeholder methods:

• public static function course_module_created(\core\event\course_module_created $event) - placeholder for saving data when assignment is created
• public static function course_module_updated(\core\event\course_module_updated $event) - placeholder for saving data when assignment is updated

Register observers in blocks/exaport/db/events.php:

• Listen to \core\event\course_module_created
• Listen to \core\event\course_module_updated

5. Code Structure Requirements

• Follow Moodle coding standards
• Use proper type hints (PHP 7.4+ style with : void return types)
• Add PHPDoc comments
• Use defined('MOODLE_INTERNAL') || die(); where appropriate
• The code should NOT actually save/load data yet - just show the dropdown and have TODO comments in the event observers

Implementation Notes

• This is a skeleton implementation for step-by-step development
• The dropdown should appear in the assignment settings form
• Data persistence will be implemented later
• All code should be production-ready in terms of structure and style, just with dummy/placeholder functionality

Expected Files to Create/Modify

1. blocks/exaport/classes/hook_listener.php (new)
2. blocks/exaport/db/hooks.php (new)
3. blocks/exaport/classes/event_observer.php (new)
4. blocks/exaport/db/events.php (new or modify)
5. blocks/exaport/lang/en/block_exaport.php (modify - add strings)

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