Align naming conventions with Transmodel and NeTEx standards across documentation

[hiletnes]

Review and update naming conventions throughout the repository to ensure consistency with Transmodel and NeTEx standards.

Tasks:

• Survey all documentation and code for naming patterns.
• Compare current terminology and formats with official Transmodel and NeTEx references, including UML and XML schema naming practices (PascalCase for types, camelCase for attributes, semantic precision for terms).
• Document proposed changes with references and rationale.
• Update affected documentation and code, prioritizing areas most critical for interoperability and standardization.

Context:

• Originally requested in README.md as:

- **TODO:** Review and harmonize naming conventions with the Transmodel and NeTEx standards.

• See Transmodel Documentation Center and NeTEx GitHub repository for naming guidelines.

Please specify:

• Any sections or files of highest priority
• Scope (documentation, code, or both)
• Preferred naming format if any (PascalCase, camelCase, etc.)
• Stakeholders to review changes
• Milestones or deadlines to consider