Allow custom regex patterns for URL detection

[bingenito]

Problem

URL detection regex is hardcoded; users can't customize detection rules.

Solution

Allow custom regex patterns via configuration.

Benefits

• Detect custom URI schemes
• Project-specific URL patterns
• Enhanced detection for specific domains

Configuration Example

{
  "customPatterns": [
    "custom://[^\\s]+",
    "internal:[a-z0-9-]+"
  ]
}

Files to Modify

• src/urlDetector.ts - Make regex configurable
• src/options.ts - Add customPatterns option

Priority

Phase 3 - Advanced Features (Medium Impact, Low Effort)

Related to TODO.md section 3.3