fix(processor): resolve fragile md replacement and multi-hash URLs

[moshams272]

This patch builds on top of the recent type-map refactor to safely handle TypeDoc URL edge cases. It prevents broken links when filenames contain '.md' before the extension using a boundary regex, and extracts the final anchor when TypeDoc generates multiple hash fragments to ensure correct browser navigation.

Summary

Fixes two critical URL routing edge cases from the recent type-map refactor (#25):

1. Fragile .md replacement: Uses /\.md($|#)/ regex to avoid breaking paths containing .md (e.g., utils.md5.md).
2. Multi-hash URLs: Extracts the final hash fragment from TypeDoc (e.g., #methods#name) to ensure correct browser anchoring.
   Follows up on issues raised in my previous PR fix(processor): resolve malformed URLs and incomplete type mapping #19.

What kind of change does this PR introduce?

Fix

Did you add tests for your changes?

No. Verified locally by running the doc generation successfully.

Does this PR introduce a breaking change?

No.

If relevant, what needs to be documented once your changes are merged or what have you already documented?

N/A.

Use of AI

All code was reviewed and tested manually.

[avivkeller]

While I appreciate the intent here, we are trying to save the bulk of this work for GSoC. We got the fundamental workings down (basic pipeline), but a lot of the work here is for GSoC, which has not begun.