Show FileMaker code instead of internal ID on org form

[maebeale]

What is the goal of this PR and why is this important?

• Replace the internal ID field with the FileMaker code field on the organization form so admins can view/edit the FileMaker Project ID directly
• Add a data migration rake task to move existing internal_id values into filemaker_code

How did you approach the change?

• Swapped internal_id for filemaker_code in the org form (admin-only field) with label "FileMaker Project ID"
• Updated strong params to permit filemaker_code instead of internal_id
• Added rake organizations:migrate_internal_id_to_filemaker_code which:
  • Copies stripped internal_id into filemaker_code when filemaker_code is blank and internal_id is present
  • Adds a comment to the organization when both fields have values that don't match after stripping
  • Skips records where values already match

UI Testing Checklist

• Verify "FileMaker Project ID" field appears on org edit form for admin users
• Verify field is hidden for non-admin users
• Verify saving a value to the field persists correctly

Anything else to add?

• Run rake organizations:migrate_internal_id_to_filemaker_code in production after deploy to migrate existing data

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