[Bugfix] Rename RouteApi to RouteAPI

[EnduranceCode]

Description

The RouteApi interface uses mixed-case Api (lowercase pi), while the project naming convention defined in the development guide requires all API interfaces to use the suffix API (all caps). The same convention is followed by the other API interface (DeviceTelemetryAPI).

File affected:

• endurancetrio-app/src/main/java/com/endurancetrio/app/tracker/api/RouteApi.java
• endurancetrio-app/src/main/java/com/endurancetrio/app/tracker/api/RouteRestController.java
  (the implements RouteApi clause must be updated to implements RouteAPI)

Acceptance Criteria

• RouteApi.java is renamed to RouteAPI.java
• All references to RouteApi are updated to RouteAPI, including the implements clause in RouteRestController
• The project builds and tests pass without errors