[18.0][MIG] crm_salesperson_planner: Migration to 18.0

[fsmw]

Summary

• Migrates crm_salesperson_planner module to Odoo 18.0
• Fixes breaking changes:
  • External ID references from %(external_id)d to %(module.external_id)d format
  • Tree view type renamed to list (Odoo 18.0 breaking change)

Changes

• Updated manifest version to 18.0.1.0.0
• Fixed 5 external ID references in XML views (4 in visit_views.xml, 1 in visit_template_views.xml)
• Converted all <tree> views to <list> (Odoo 18.0 breaking change):
  • crm_salesperson_planner_visit_views.xml
  • crm_salesperson_planner_visit_template_views.xml
  • crm_salesperson_planner_visit_close_reason_views.xml
• Updated all view_mode references from 'tree,form' to 'list,form'

Testing

• ✅ Pre-commit checks passing (ruff, pylint, prettier, eslint)
• ✅ No linting errors
• ✅ XML validation passing
• ✅ Code quality checks passing

Related Issue

Part of #600 - Migration to version 18.0