Improve report readability and add score breakdown

- Add Score Breakdown section showing how score is calculated
- Convert variable-style flag names to readable titles (e.g. UnverifiedDirectorClaim -> Unverified Director Claim)
- Deduplicate flags in report display for existing reports
- Make verification notes more user-friendly
- Add "How Scoring Works" explanation panel

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

src/TrueCV.Infrastructure/Jobs/ProcessCVCheckJob.cs

@@ -304,6 +304,7 @@ public sealed class ProcessCVCheckJob
                         "SeniorRoleAtMicroCompany" => "Senior Role at Micro Company",
                         "SicCodeMismatch" => "Role/Industry Mismatch",
                         "ImplausibleJobTitle" => "Implausible Job Title",
+                        "UnverifiedDirectorClaim" => "Unverified Director Claim",
                         _ => companyFlag.Type
                     },
                     Description = companyFlag.Message,