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/api/Dockerfile

@@ -6,6 +6,7 @@ COPY Apis/api/api.csproj Apis/api/
 COPY Apis/shared-models/shared-models.csproj Apis/shared-models/
 COPY Apis/api-models/api-models.csproj Apis/api-models/
 COPY Apis/cv-matcher-api-models/cv-matcher-api-models.csproj Apis/cv-matcher-api-models/
+COPY Apis/myai-models/myai-models.csproj Apis/myai-models/
 COPY Helpers/startup-helpers/startup-helpers.csproj Helpers/startup-helpers/
 
 RUN dotnet restore Apis/api/api.csproj
@@ -14,6 +15,7 @@ COPY Apis/api/ Apis/api/
 COPY Apis/shared-models/ Apis/shared-models/
 COPY Apis/api-models/ Apis/api-models/
 COPY Apis/cv-matcher-api-models/ Apis/cv-matcher-api-models/
+COPY Apis/myai-models/ Apis/myai-models/
 COPY Helpers/startup-helpers/ Helpers/startup-helpers/
 
 RUN dotnet publish Apis/api/api.csproj -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false