Update Packt integration for current Packtpub API/login/claim flows

[Copilot]

Packt’s legacy services.packtpub.com auth/claim flow no longer matches current Packt behavior, causing free-learning claim and owned-download workflows to fail. This change aligns authentication, offer discovery, entitlement retrieval, and download URL construction with current Packt endpoints/page structure.

• API/client migration

  • Switched auth + session handling to current Packt web APIs:
    • POST /api/login
    • GET /api/entitlements/users/me/owned
    • POST /api/claim-free-learning/offers/{offer_id}
  • Updated product summary/download targets to subscription APIs.
  • Moved request timeout to per-request defaults in the API wrapper.

• Free-learning claim path update

  • Replaced old offers endpoint logic with extraction of offerId and metaProductId from /free-learning page source.
  • Added parsing safeguards and clearer failure logging when offer metadata is missing.
  • Kept already-claimed handling intact via owned-product cross-check.

• Owned library + pagination hardening

  • Reworked owned-products fetch to iterative pagination against the new entitlements endpoint.
  • Normalized product ID/title field fallbacks across response variants.

• Download flow compatibility

  • Updated download URL strategy to current file-type mapping (pdf -> ebook, code -> code_bundle, video -> video_zip).
  • Added response-shape guards and unsupported-format validation.

• Packaging/docs updates

  • Added curl-cffi==0.15.0 dependency for browser-like session behavior.
  • Bumped package metadata version and tarball URL.
  • Updated README free-learning URL to current path.

# New download mapping used by downloader
PACKT_FILE_FORMAT_MAPPING = {
    "pdf": "ebook",
    "epub": "epub",
    "mobi": "mobi",
    "code": "code_bundle",
    "video": "video_zip",
}

[Copilot]

Pull request overview

This PR updates the Packt integration to match Packt’s current web/API authentication, free-learning claim flow, owned-entitlements retrieval, and download URL patterns so the CLI can claim and download content again.

Changes:

• Migrates authentication/session handling to Packt’s current /api/login flow using curl-cffi for browser impersonation.
• Updates free-learning claiming to parse offerId/metaProductId from the /free-learning page and claim via the new endpoint.
• Updates owned library pagination and download URL construction (including file-type mapping), plus bumps package version/deps and README URL.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
setup.py	Bumps package version/url and adds curl-cffi dependency required for the new session behavior.
README.md	Updates the documented Free Learning URL to the current Packt path.
packt/api.py	Switches to cookie/session-based auth via curl_cffi.requests and adds per-request timeouts.
packt/claimer.py	Reworks owned-products pagination and updates free-learning offer discovery + claim call.
packt/downloader.py	Adds file-type mapping and updates download URL building and fetch logic.

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