feat: Add paths getter, toString, and toDot to PathTrie for debugging

[nielsenko]

Description

Adds debugging functionality to PathTrie for diagnosing routing issues:

• paths getter - Returns all registered path patterns as Iterable<String>
• toString() override - Quick text dump of all paths
• toDot() method - DOT graph output for Graphviz visualization, with cycles from self-attachment shown as dashed red edges

All methods handle cycles created by self-attachment.

Related Issues

• Closes: Dump all paths in PathTrie #319

Pre-Launch Checklist

• This update focuses on a single feature or bug fix.
• I have read and followed the Dart Style Guide and formatted the code using dart format.
• I have referenced at least one issue this PR fixes or is related to.
• I have updated/added relevant documentation (doc comments with ///), ensuring consistency with existing project documentation.
• I have added new tests to verify the changes.
• All existing and new tests pass successfully.
• I have documented any breaking changes below.

Breaking Changes

• No breaking changes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.31%. Comparing base (196eef7) to head (1e4279d).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #320       +/-   ##
===========================================
+ Coverage   27.95%   91.31%   +63.36%     
===========================================
  Files          87       97       +10     
  Lines        3291     3777      +486     
  Branches     1735     1929      +194     
===========================================
+ Hits          920     3449     +2529     
+ Misses       2371      328     -2043     

Flag	Coverage Δ
relic_core	91.06% <100.00%> (?)
relic_io	93.27% <ø> (?)

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