Resume Analyzer Explainability

[Aditya8369]

Resume analysis now returns structured skill explanations alongside the existing matchedSkills and missingSkills fields, and the model can persist them in ResumeAnalysis.model.js. The controller now builds per-skill evidence from the resume text and required skill source, so each skill gets a status, matchedType, matchedBecause notes, and source context in resumeAnalyzer.controller.js. On the UI, AnalysisResults.jsx now shows expandable rows for each skill with the explanation behind the match or miss.

Validation passed: get_errors was clean for the edited files, and a direct Node module-load check for the analyzer backend succeeded. The only output was the existing mongoose duplicate-index warning from other models, which is unrelated to this feature.

closes #203

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[Aditya8369]

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