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.Web/appsettings.json

@@ -18,6 +18,16 @@
     "ConnectionString": "",
     "ContainerName": "cv-uploads"
   },
+  "FcaRegister": {
+    "ApiKey": "",
+    "Email": ""
+  },
+  "GitHub": {
+    "PersonalAccessToken": ""
+  },
+  "OpenCorporates": {
+    "ApiToken": ""
+  },
   "Serilog": {
     "MinimumLevel": {
       "Default": "Information",