Respect UI language in match result — LLM responds in user's selected language

The frontend sends the active language code (currentLang()) with every match
request. CvMatcherService injects a language instruction into the system prompt
so the LLM returns summary, strengths, gaps, recommendations, and evidence in
the correct language. The match result cache (CvMatchResults) now includes
Language as part of the lookup key so Romanian and English results are stored
and retrieved independently. Existing cached rows default to 'en'.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Apis/cv-matcher-api/Data/Repositories/Contracts/IMatcherRepository.cs

@@ -5,8 +5,8 @@ namespace Api.Data.Repositories.Contracts;
 public interface IMatcherRepository
 {
     Task InitializeAsync(CancellationToken ct);
-    Task<JobMatchResponse?> GetMatchAsync(string cvDocumentId, string jobDocumentId, CancellationToken ct);
-    Task SaveMatchAsync(string cvDocumentId, string jobDocumentId, JobMatchResponse response, CancellationToken ct);
+    Task<JobMatchResponse?> GetMatchAsync(string cvDocumentId, string jobDocumentId, string language, CancellationToken ct);
+    Task SaveMatchAsync(string cvDocumentId, string jobDocumentId, string language, JobMatchResponse response, CancellationToken ct);
     Task<string?> GetChatCompletionAsync(string cacheKey, CancellationToken ct);
     Task SaveChatCompletionAsync(string cacheKey, string model, decimal temperature, string responseText, CancellationToken ct);
 }

Apis/cv-matcher-api/Data/Repositories/EfMatcherRepository.cs

@@ -24,11 +24,11 @@ public sealed class EfMatcherRepository : IMatcherRepository
         //await _db.Database.EnsureCreatedAsync(ct);
     }
 
-    public async Task<JobMatchResponse?> GetMatchAsync(string cvDocumentId, string jobDocumentId, CancellationToken ct)
+    public async Task<JobMatchResponse?> GetMatchAsync(string cvDocumentId, string jobDocumentId, string language, CancellationToken ct)
     {
         var json = await _db.CvMatchResults
             .AsNoTracking()
-            .Where(x => x.CvDocumentId == cvDocumentId && x.JobDocumentId == jobDocumentId)
+            .Where(x => x.CvDocumentId == cvDocumentId && x.JobDocumentId == jobDocumentId && x.Language == language)
             .Select(x => x.ResultJson)
             .FirstOrDefaultAsync(ct);
 
@@ -39,10 +39,10 @@ public sealed class EfMatcherRepository : IMatcherRepository
         return result;
     }
 
-    public async Task SaveMatchAsync(string cvDocumentId, string jobDocumentId, JobMatchResponse response, CancellationToken ct)
+    public async Task SaveMatchAsync(string cvDocumentId, string jobDocumentId, string language, JobMatchResponse response, CancellationToken ct)
     {
         var exists = await _db.CvMatchResults.AnyAsync(
-            x => x.CvDocumentId == cvDocumentId && x.JobDocumentId == jobDocumentId,
+            x => x.CvDocumentId == cvDocumentId && x.JobDocumentId == jobDocumentId && x.Language == language,
             ct);
 
         if (exists) return;
@@ -52,6 +52,7 @@ public sealed class EfMatcherRepository : IMatcherRepository
             Id = Guid.NewGuid().ToString("N"),
             CvDocumentId = cvDocumentId,
             JobDocumentId = jobDocumentId,
+            Language = language,
             ResultJson = JsonSerializer.Serialize(response, new JsonSerializerOptions(JsonSerializerDefaults.Web)),
             Score = response.Score,
             CreatedAt = DateTime.UtcNow