fix: repair job_type dropdown options and remove job_logo from forms

The job_type select field had empty options because Formidable stores
them in a top-level `options` key, not nested inside `field_options`.
The job_logo field is removed from both submission and edit forms since
the logo is managed per-provider on the dashboard.

Includes a one-time repair migration that fixes existing fields in the
database (updates job_type options, deletes job_logo fields).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

includes/class-acf-fields.php

@@ -68,17 +68,6 @@ class DDHH_JM_ACF_Fields {
 						'type'     => 'email',
 						'required' => 1,
 					),
-					// Job Logo
-					array(
-						'key'           => 'field_job_logo',
-						'label'         => __( 'Logo', 'ddhh-job-manager' ),
-						'name'          => 'job_logo',
-						'type'          => 'image',
-						'required'      => 0,
-						'return_format' => 'id',
-						'preview_size'  => 'thumbnail',
-						'library'       => 'all',
-					),
 					// Job Deactivation Reason (internal, admin-only)
 					array(
 						'key'               => 'field_job_deactivation_reason',