✨ Add dual token location pattern documentation and example

[yezz123]

Fixes #771

• Introduced a new section in the documentation detailing the dual location pattern for access and refresh tokens.
• Added example code for implementing access tokens in headers and refresh tokens in HTTP-only cookies.
• Created a new example script demonstrating the complete flow of login, token retrieval, refresh, and logout using this pattern.

[vercel]

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Project	Deployment	Review	Updated (UTC)
authx	Ready	Preview, Comment	Jan 4, 2026 5:10pm

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.69%. Comparing base (d8ecc5f) to head (f58bca0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #786   +/-   ##
=======================================
  Coverage   96.69%   96.69%           
=======================================
  Files          15       15           
  Lines         786      786           
  Branches       79       79           
=======================================
  Hits          760      760           
  Misses         20       20           
  Partials        6        6           

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