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>

Jobs/cv-search-job/Dockerfile

@@ -7,6 +7,7 @@ COPY Jobs/job-scheduler/job-scheduler.csproj Jobs/job-scheduler/
 COPY Apis/cv-search-models/cv-search-models.csproj Apis/cv-search-models/
 COPY Apis/cv-matcher-api-models/cv-matcher-api-models.csproj Apis/cv-matcher-api-models/
 COPY Apis/shared-models/shared-models.csproj Apis/shared-models/
+COPY Apis/myai-models/myai-models.csproj Apis/myai-models/
 COPY Helpers/startup-helpers/startup-helpers.csproj Helpers/startup-helpers/
 
 RUN dotnet restore Jobs/cv-search-job/cv-search-job.csproj
@@ -16,6 +17,7 @@ COPY Jobs/job-scheduler/ Jobs/job-scheduler/
 COPY Apis/cv-search-models/ Apis/cv-search-models/
 COPY Apis/cv-matcher-api-models/ Apis/cv-matcher-api-models/
 COPY Apis/shared-models/ Apis/shared-models/
+COPY Apis/myai-models/ Apis/myai-models/
 COPY Helpers/startup-helpers/ Helpers/startup-helpers/
 
 RUN dotnet publish Jobs/cv-search-job/cv-search-job.csproj -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false