fix(configuration): correct TLS naming in v3 schema

[josecelano]

Summary

Correct TLS terminology in the v3 configuration schema and schema-neutral Axum helper module while preserving the v2 configuration contract until final migration.

• add v3_0_0::tls::TlsConfig and rename v3 DTO fields to tls_config
• rename axum-server::tsl to axum-server::tls and update direct imports
• retain v2 TslConfig and tsl_config names until Configuration overhaul final cleanup: remove global re-exports, migrate consumers to explicit versioned imports #1980 migrates consumers atomically
• update current v3/open issue documentation and record verification evidence

Verification

• linter all
• cargo test --workspace
• nightly format, workspace check, and documentation build via pre-push
• full stable test suite via pre-push

Closes #1981
Part of #1978

[Copilot]

Pull request overview

This PR corrects TLS terminology in the v3.0.0 configuration schema and standardizes the schema-neutral Axum TLS helper module naming (tsl → tls), while explicitly preserving the v2 compatibility contract (TslConfig / tsl_config) until the final consumer migration in #1980.

Changes:

• Introduces v3_0_0::tls::TlsConfig and renames v3 DTO fields from tsl_config to tls_config (with unit tests proving TOML deserialization).
• Renames the Axum helper module path torrust_tracker_axum_server::tsl → ...::tls and updates imports across bootstrap and server packages.
• Updates v3 docs and relevant open issue specs to reflect the corrected TLS naming and the intentional v2/v3 boundary.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/bootstrap/jobs/tracker_apis.rs	Update Axum TLS helper import path to tls.
src/bootstrap/jobs/http_tracker.rs	Update Axum TLS helper import path to tls.
packages/configuration/src/v3_0_0/tracker_api.rs	Rename v3 HTTP API TLS field to tls_config and add deserialization test.
packages/configuration/src/v3_0_0/tls.rs	Add new v3-owned TlsConfig DTO.
packages/configuration/src/v3_0_0/mod.rs	Fix v3 docs from “TSL” to “TLS” and export tls module.
packages/configuration/src/v3_0_0/http_tracker.rs	Rename v3 HTTP tracker TLS field to tls_config and add deserialization test.
packages/axum-server/src/tls.rs	Rename local parameter identifiers to tls_* while retaining TslConfig type boundary.
packages/axum-server/src/lib.rs	Switch module export from tsl to tls.
packages/axum-server/README.md	Update docs to refer to tls.rs.
packages/axum-rest-api-server/src/testing/environment.rs	Update Axum TLS helper import path + comment wording.
packages/axum-rest-api-server/src/server.rs	Update Axum TLS helper import path + comment wording.
packages/axum-http-server/src/testing/environment.rs	Update Axum TLS helper import path.
packages/axum-http-server/src/server.rs	Update Axum TLS helper import path + comment wording.
docs/issues/open/1981-1978-fix-tsl-config-tls-config-typo.md	Record the compatibility boundary and mark the subissue as completed.
docs/issues/open/1979-1978-copy-configuration-schema-v2-to-v3-baseline.md	Mark the baseline-copy subissue as completed and update progress metadata.
docs/issues/open/1978-configuration-overhaul-epic.md	Update EPIC subissue table to reflect #1979/#1981 completion.
docs/issues/open/1640-1978-per-http-tracker-on-reverse-proxy-setting.md	Update forward-looking v3 docs to use tls_config terminology.

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[josecelano]

ACK 3d6e95f