Prefix all api routes with /v1/ to allow future increments

[ahouseholder]

This PR amends the FastAPI implementation in #894 to prefix all API URLs with /v1/. This will allow us to update the API in the future by just adding a new prefix. All other changes are incidental to this, including refactoring the ssvc.api module to include an ssvc.api.v1 submodule.

Copilot Summary

This pull request refactors the API routing structure to support versioning and improves code organization by moving router and response model modules under a new v1 namespace. It introduces a top-level API router for version 1 (router_v1), consolidates route registration, and updates all imports and test references to use the new structure. This change lays the groundwork for future API versioning and makes the codebase easier to maintain.

API Versioning and Routing:

• Added a new src/ssvc/api/v1/routers/v1_router.py file that defines a versioned API router (router_v1) and consolidates the registration of all endpoint routers under the /v1 prefix.
• Updated src/ssvc/api/main.py to register only the versioned router (router_v1), removing direct registration of individual routers. [1] [2]
• Created src/ssvc/api/v1/__init__.py to expose the versioned router for import.

Module Organization:

• Renamed all router and response model modules from ssvc.api.routers and ssvc.api.response_models to their respective ssvc.api.v1 namespaces, and updated all internal imports accordingly. [1] [2] [3] [4] [5] [6] [7]

Test Updates:

• Updated all test imports and patch references to use the new ssvc.api.v1.routers paths, ensuring tests continue to work with the refactored API structure. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]

[sei-vsarvepalli]

All checks out well /docs shows new URL's too.