Add create_job_application_form() method with 4 fields:
- applicant_name (text, required)
- applicant_email (email, required, pre-filled for logged-in users)
- applicant_message (textarea, required)
- job_id (hidden)
Form title: "Jetzt bewerben"
Submit button: "Bewerbung absenden"
Success message: "Ihre Bewerbung wurde versendet. Der Anbieter wird sich bei Ihnen melden."
Added get_job_application_form_id() helper method
Registered form creation in setup_registration_hooks()
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>