🚀 Feature: Add configurable link URL prefixes to parser configuration

[- nyankoiscat - (Hikkywannafly)]

Problem

Extend TSDocConfiguration with a new public setting for URI-style prefixes (e.g. xref, mailto) that should be recognized as URL destinations in {@link ...} tags, even when they do not use ://. This must preserve existing behavior for scheme:// while allowing explicit opt-in for additional protocols.

Severity: high
File: tsdoc/src/configuration/TSDocConfiguration.ts

Solution

Add a private normalized set (e.g. _linkUrlPrefixes: Set<string>) and public APIs to manage it (getter + mutator methods such as addLinkUrlPrefix(), clearLinkUrlPrefixes(), possibly isLinkUrlPrefixAllowed()). Validate prefixes using a strict scheme-like grammar (^[A-Za-z][A-Za-z0-9+.-]*$) and normalize case (lowercase) for matching. Keep default empty so current behavior is unchanged unless configured.

Changes

• tsdoc/src/configuration/TSDocConfiguration.ts (modified)
• tsdoc/src/parser/NodeParser.ts (modified)
• tsdoc/src/parser/__tests__/NodeParserLinkTag.test.ts (modified)

Testing

• Existing tests pass
• Manual review completed
• No new warnings/errors introduced

Closes #227

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