feat: Add additional verification APIs (FCA, SRA, GitHub, OpenCorporates, ORCID)

This adds five new free API integrations for enhanced CV verification:

- FCA Register API: Verify financial services professionals
- SRA Register API: Verify solicitors and legal professionals
- GitHub API: Verify developer profiles and technical skills
- OpenCorporates API: Verify international companies across jurisdictions
- ORCID API: Verify academic researchers and publications

Includes:
- API clients for all five services with retry policies
- Service implementations with name matching and validation
- Models for verification results with detailed flags
- Configuration options in appsettings.json
- DI registration for all services

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/RealCV.Application/Interfaces/IInternationalCompanyVerifierService.cs

@@ -0,0 +1,49 @@
+using RealCV.Application.Models;
+
+namespace RealCV.Application.Interfaces;
+
+/// <summary>
+/// Service for verifying international companies via OpenCorporates
+/// </summary>
+public interface IInternationalCompanyVerifierService
+{
+    /// <summary>
+    /// Verify an international company
+    /// </summary>
+    Task<InternationalCompanyResult> VerifyCompanyAsync(
+        string companyName,
+        string? jurisdiction = null,
+        DateOnly? claimedStartDate = null,
+        DateOnly? claimedEndDate = null);
+
+    /// <summary>
+    /// Search for companies across all jurisdictions
+    /// </summary>
+    Task<List<OpenCorporatesSearchResult>> SearchCompaniesAsync(
+        string query,
+        string? jurisdiction = null);
+
+    /// <summary>
+    /// Get list of supported jurisdictions
+    /// </summary>
+    Task<List<JurisdictionInfo>> GetJurisdictionsAsync();
+}
+
+public sealed record OpenCorporatesSearchResult
+{
+    public required string CompanyName { get; init; }
+    public required string CompanyNumber { get; init; }
+    public required string Jurisdiction { get; init; }
+    public string? JurisdictionCode { get; init; }
+    public string? Status { get; init; }
+    public DateOnly? IncorporationDate { get; init; }
+    public string? OpenCorporatesUrl { get; init; }
+    public double? MatchScore { get; init; }
+}
+
+public sealed record JurisdictionInfo
+{
+    public required string Code { get; init; }
+    public required string Name { get; init; }
+    public string? Country { get; init; }
+}