chore: Remove OpenCorporates integration (requires paid plan for commercial use)

Keep only the genuinely free APIs:
- FCA Register (free with registration)
- SRA Register (free public API)
- GitHub (free tier sufficient)
- ORCID (free public API)

🤖 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

@@ -1,49 +0,0 @@
-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; }
-}