feat: DB-backed localized templates + language-aware emails

- New Apis/myai-models project: MyAiDbContext (schema myAi), TemplateEntity,
  ITemplateService, DbTemplateService with 10-min in-memory cache
- Seeds EN+RO variants for all user-facing templates (match email, job search
  results email, HTML status pages, AI system prompt)
- Match result email now sent in user's UI language (en/ro)
- Job search results email now respects session language
- Language propagates: MatchJobRequest -> token -> session -> email
- Add Language column to JobSearchTokens and JobSearchSessions (default 'en')
- All three Dockerfiles updated to include myai-models in build context

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

Apis/cv-matcher-api/Services/CvMatcherService.cs

@@ -7,6 +7,7 @@ using CvMatcher.Models.Responses;
 using CvMatcher.Models.Settings;
 using Api.Services.Contracts;
 using Microsoft.Extensions.Options;
+using MyAi.Models.Services;
 
 namespace Api.Services;
 
@@ -17,19 +18,22 @@ public sealed class CvMatcherService : ICvMatcherService
     private readonly IMatcherAiClient _ai;
     private readonly IMatcherRepository _repository;
     private readonly MatcherSettings _settings;
+    private readonly ITemplateService _templates;
 
     public CvMatcherService(
         IRagApiClient rag,
         IJobTextExtractor jobTextExtractor,
         IMatcherAiClient ai,
         IMatcherRepository repository,
-        IOptions<MatcherSettings> options)
+        IOptions<MatcherSettings> options,
+        ITemplateService templates)
     {
         _rag = rag;
         _jobTextExtractor = jobTextExtractor;
         _ai = ai;
         _repository = repository;
         _settings = options.Value;
+        _templates = templates;
     }
 
     public async Task<CvUploadResponse> UploadCvAsync(IFormFile file, CancellationToken ct)
@@ -111,12 +115,8 @@ public sealed class CvMatcherService : ICvMatcherService
         var evidence = evidenceChunks.Count > 0 ? string.Join("\n\n", evidenceChunks.Take(4)) : Limit(job.Text, 4000);
         var languageName = LanguageName(language);
 
-        var systemPrompt = $$"""
-            You are a strict CV-to-job matching engine. Return JSON only. Score realistically from 0 to 100.
-            Penalize missing required skills. Do not invent experience. Use concise business language.
-            Respond entirely in {{languageName}} — all text fields in the JSON must be in {{languageName}}.
-            JSON shape: {"score":number,"summary":"...","strengths":["..."],"gaps":["..."],"recommendations":["..."],"evidence":["..."]}
-            """;
+        var systemPrompt = _templates.Render("ai.cv-match.system-prompt", "*",
+            ("languageName", languageName));
 
         var userPrompt = $"""
             CV: