refactor: update API versioning and restructure routes for cleaner organization

[ronibhakta1]

This pull request removes the /v1 API prefix from all endpoints, making /voices and /synthesize the new canonical routes. It updates the codebase, documentation, configuration, tests, and nginx templates to reflect this breaking change. The api_v1_prefix setting and related files are removed, and all references to /v1/ in endpoints, docs, and tests are updated accordingly.

API Route Changes:

• Removed the /v1 prefix from all API endpoints; /voices and /synthesize are now accessed at the root level. [1] [2] [3] [4] [5]

Documentation Updates:

• Updated all documentation files to reference /voices and /synthesize instead of /v1/voices and /v1/synthesize. This includes user docs, API docs, configuration, and development guides. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Configuration and Nginx:

• Removed the api_v1_prefix setting from configuration and environment files. Updated nginx templates to rate-limit and proxy the new /synthesize endpoint. [1] [2] [3]

Test Suite Updates:

• Updated all test cases to use the new root-level endpoints, ensuring tests match the current API routes. [1] [2] [3] [4] [5] [6] [7] [8]

Miscellaneous:

• Added a link to the live demo in the README.md.