feat: Implement Phase 10 support and recommendations features

- Added models for support messages, SLA policies, tickets, ticket events, and ticket links.
- Created routes for help, help admin, newsletter, recommendations, and support for both customer and admin.
- Developed services for help, marketing (newsletter), and recommendations.
- Introduced support service for ticket management, including creation, replies, transitions, and attachments.
- Added validation schemas for support recommendations and ticket management.
- Implemented a cron job for support reconciliation and recommendation cleanup.
- Created migration for new support and recommendation database tables.
- Added unit tests for validation and policy checks related to Phase 10 features.

app/models/help/helpCategoryTranslation.model.js

@@ -0,0 +1 @@
+module.exports=(s,D)=>s.define("HelpCategoryTranslation",{id:{type:D.STRING,primaryKey:true},category_id:{type:D.STRING,allowNull:false},locale:{type:D.ENUM("en","si","ta"),allowNull:false},name:{type:D.STRING(160),allowNull:false},description:D.STRING(500)},{tableName:"help_category_translations",timestamps:true,indexes:[{unique:true,fields:["category_id","locale"]}]});