perf: get_localised_vector with pre-compiled regex

[saquibsaifee]

Description

💡 What:
Optimized get_localised_vector in VulnerabilityScoreSource to use pre-compiled module-level regular expressions instead of calling re.sub() inline.

🎯 Why:
Pre-compiling the regexes (_RE_CVSS_V4, _RE_CVSS_V3, _RE_CVSS_V2, _RE_OWASP) prevents Python from recompiling the pattern or querying its internal regex cache every time get_localised_vector is called.

📊 Measured Improvement:
Measured performance over 100,000 iterations for the regex substitution block:

• Baseline: 0.7516 seconds
• Optimized: 0.5333 seconds
• Improvement: ~30% faster execution time for regex substitution.

AI Tool Disclosure

• My contribution includes AI-generated content, as disclosed below:
  • AI Tools: Gemini Jules
  • LLMs and versions: Gemini 3.1 Pro

Affirmation

• My code follows the CONTRIBUTING.md guidelines

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 duplication

Metric	Results
Duplication	0

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[read-the-docs-community]

Documentation build overview

📚 CycloneDX Python Library | 🛠️ Build #34341811 | 📁 Comparing f81d6bb against latest (52cb3c9)

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2 files changed

± autoapi/cyclonedx/model/vulnerability/index.html
± autoapi/cyclonedx/contrib/vulnerability/cvss/index.html