Expose per-provider cache_duration option

[turegjorup]

Summary

Adds a per-provider cache_duration (seconds) option that's forwarded to the underlying library's cacheDuration constructor option. Controls the TTL of the cached OIDC discovery document and JWKS.

itkdev_openid_connect:
  openid_providers:
    admin:
      options:
        # ... existing keys ...
        cache_duration: 3600  # default 86400 (24h)

Why

Surfaced during a recent verification of the cache flow: the library already caches the discovery document and JWKS via the bundle-supplied cache.app pool (no per-request IdP calls), but the TTL was hard-coded to the library default of 24h with no way for bundle consumers to shorten it for tighter key-rotation windows or extend it for stable IdPs.

Backward compatibility

Additive only. Defaults to 86400 (matching the library default) so existing configurations behave identically. The option is forwarded only when set, and the bundle's default mirrors the library's.

Test plan

• task test — 47 tests pass (one new + two extended existing assertions)
• task analyze:php — phpstan max level, no errors
• task lint — clean
• task test:matrix — all 6 PHP × deps combinations green

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2d3781c) to head (1874fa3).

Additional details and impacted files

@@             Coverage Diff             @@
##             develop       #34   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        57        58    +1     
===========================================
  Files              9         9           
  Lines            268       274    +6     
===========================================
+ Hits             268       274    +6     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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