Fix route matching when Next.js trailingSlash is enabled

[tusharpandey13]

Fix route matching when Next.js trailingSlash is enabled (#1938)

Fixes #1938

Problem

When using trailingSlash: true in next.config.js, the SDK's authentication routes (login, logout, etc.) returned 404 errors due to strict path comparisons that didn't account for trailing slashes.

Solution

Normalize pathnames before route matching:

• Added removeTrailingSlash utility to consistently handle paths
• Centralized path utilities in pathUtils.ts for better maintainability
• Updated route handling to compare sanitized paths

Key Changes

1. Path normalization: Removes trailing slashes from incoming request paths before matching against configured routes
2. Code organization: Moved path utilities to dedicated module
3. Backwards compatibility: Maintains existing URL construction behavior while improving route matching reliability

This ensures routes work correctly regardless of Next.js' trailingSlash configuration, without breaking existing implementations.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.27%. Comparing base (47e45ee) to head (6aac597).

Files with missing lines	Patch %	Lines
src/utils/pathUtils.ts	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1948      +/-   ##
==========================================
+ Coverage   76.21%   76.27%   +0.05%     
==========================================
  Files          20       21       +1     
  Lines        1505     1513       +8     
  Branches      238      242       +4     
==========================================
+ Hits         1147     1154       +7     
- Misses        351      352       +1     
  Partials        7        7              

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[nandan-bhat]

Please add test coverage to the above utility methods.