feat(server-lib): extract torrust-server-lib to standalone repository

[josecelano]

Summary

Extract torrust-server-lib to its own standalone repository at torrust/torrust-server-lib.

Changes

• New standalone repo: torrust/torrust-server-lib created with CI, linter configs, and self-contained Cargo.toml
• Published: torrust-server-lib v0.1.0 on crates.io
• Consumer migration: All 6 workspace consumers updated from path dep to torrust-server-lib = "0.1.0":
  • Root Cargo.toml workspace dep registration
  • axum-health-check-api-server, axum-http-server, axum-rest-api-server
  • axum-server, udp-server
• Cleanup: packages/server-lib/ removed from workspace
• Docs: AGENTS.md, packages/AGENTS.md, docs/packages.md updated to move server-lib to extracted section
• EPIC Overhaul: packages #1669: Package inventory and Active Subissues tables updated

Verification

• cargo build --workspace passes
• cargo test --doc --workspace passes
• cargo test --tests --workspace --all-targets --all-features passes
• linter all passes
• cargo machete clean (pre-existing unrelated warning only)
• No path deps on torrust-server-lib remain
• packages/server-lib/ directory removed

Closes #1909

[Copilot]

Pull request overview

This PR completes the extraction of torrust-server-lib from the torrust-tracker Cargo workspace into a standalone repository (torrust/torrust-server-lib) and migrates all in-workspace consumers to the crates.io release (torrust-server-lib = "0.1.0"), removing the in-repo packages/server-lib/ crate.

Changes:

• Migrates all workspace consumers (and the root workspace dependency registration) from a path dependency on packages/server-lib to torrust-server-lib = "0.1.0".
• Removes the packages/server-lib/ crate from this repository (source, Cargo.toml, README, LICENSE).
• Updates package inventory/docs to reflect server-lib as an extracted package and updates EPIC #1669 tracking.

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
Cargo.toml	Switches workspace dep registration for torrust-server-lib from path to crates.io 0.1.0.
Cargo.lock	Updates lockfile entry to registry-sourced torrust-server-lib 0.1.0.
AGENTS.md	Moves server-lib to extracted packages list (but currently misses clock in that table).
packages/AGENTS.md	Updates architecture + package catalog to classify server-lib as extracted.
docs/packages.md	Removes server-lib from in-workspace list and adds it to extracted packages table.
docs/issues/open/1909-1669-si-28-extract-server-lib-to-standalone-repo.md	Marks the extraction work as completed and updates checklists/status (with some internal inconsistencies to resolve).
docs/issues/open/1669-overhaul-packages/EPIC.md	Updates EPIC inventory and extracted packages tracking to include torrust-server-lib.
packages/axum-health-check-api-server/Cargo.toml	Migrates torrust-server-lib dependency from path to crates.io 0.1.0.
packages/axum-http-server/Cargo.toml	Migrates torrust-server-lib dependency from path to crates.io 0.1.0.
packages/axum-rest-api-server/Cargo.toml	Migrates torrust-server-lib dependency from path to crates.io 0.1.0.
packages/axum-server/Cargo.toml	Migrates torrust-server-lib dependency from path to crates.io 0.1.0.
packages/udp-server/Cargo.toml	Migrates torrust-server-lib dependency from path to crates.io 0.1.0.
packages/server-lib/src/signals.rs	Removed as part of deleting the extracted crate from this repo.
packages/server-lib/src/registar.rs	Removed as part of deleting the extracted crate from this repo.
packages/server-lib/src/logging.rs	Removed as part of deleting the extracted crate from this repo.
packages/server-lib/src/lib.rs	Removed as part of deleting the extracted crate from this repo.
packages/server-lib/README.md	Removed as part of deleting the extracted crate from this repo.
packages/server-lib/LICENSE	Removed as part of deleting the extracted crate from this repo.
packages/server-lib/Cargo.toml	Removed as part of deleting the extracted crate from this repo.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.41%. Comparing base (4022cc4) to head (22eb810).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1922      +/-   ##
===========================================
- Coverage    79.42%   79.41%   -0.01%     
===========================================
  Files          327      324       -3     
  Lines        23024    22963      -61     
  Branches     23024    22963      -61     
===========================================
- Hits         18287    18237      -50     
+ Misses        4476     4462      -14     
- Partials       261      264       +3     

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[josecelano]

ACK 22eb810