Add comprehensive CV verification checks and dashboard auto-refresh

- Add dashboard auto-refresh polling to update when processing completes
- Skip verification for freelance employers (but not contractors)
- Add incorporation date check (flags employment before company existed)
- Add dissolution date check (flags employment at dissolved companies)
- Add dormant company check (flags non-director roles at dormant companies)
- Add company size vs role check (flags senior roles at micro-entities)
- Add SIC code mismatch check (flags tech roles at non-tech companies)
- Add director verification against Companies House officers
- Add rapid career progression detection (3+ seniority jumps in <2 years)
- Add early career senior role detection (<2 years after education)
- Extend CompanyVerificationResult with flags and company data
- Add officers endpoint to Companies House client
- Fix null reference warning in Report.razor

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/TrueCV.Web/Components/Pages/Report.razor

@@ -115,7 +115,7 @@
                     <div class="card-body p-4">
                         <div class="row align-items-center">
                             <div class="col-md-4 text-center border-end">
-                                <div class="score-circle @GetScoreColorClass(_report.OverallScore) mx-auto mb-2">
+                                <div class="score-circle @GetScoreColorClass(_report!.OverallScore) mx-auto mb-2">
                                     <span class="score-value">@_report.OverallScore</span>
                                 </div>
                                 <h5 class="mb-0">@_report.ScoreLabel</h5>