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/helpArticle.model.js

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+module.exports=(s,D)=>s.define("HelpArticle",{id:{type:D.STRING,primaryKey:true},slug:{type:D.STRING(180),allowNull:false,unique:true},category_id:{type:D.STRING,allowNull:false},article_type:{type:D.ENUM("ARTICLE","FAQ"),allowNull:false,defaultValue:"ARTICLE"},status:{type:D.ENUM("DRAFT","PUBLISHED","ARCHIVED"),allowNull:false,defaultValue:"DRAFT"},sort_order:{type:D.INTEGER,allowNull:false,defaultValue:0},is_featured:{type:D.BOOLEAN,allowNull:false,defaultValue:false},published_at:D.DATE,created_by:{type:D.STRING,allowNull:false},updated_by:D.STRING},{tableName:"help_articles",timestamps:true});

app/models/help/helpArticleTranslation.model.js

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+module.exports=(s,D)=>s.define("HelpArticleTranslation",{id:{type:D.STRING,primaryKey:true},article_id:{type:D.STRING,allowNull:false},locale:{type:D.ENUM("en","si","ta"),allowNull:false},title:{type:D.STRING(220),allowNull:false},summary:D.STRING(500),body:{type:D.TEXT("long"),allowNull:false},seo_title:D.STRING(220),seo_description:D.STRING(500)},{tableName:"help_article_translations",timestamps:true,indexes:[{unique:true,fields:["article_id","locale"]}]});

app/models/help/helpCategory.model.js

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+module.exports=(s,D)=>s.define("HelpCategory",{id:{type:D.STRING,primaryKey:true},slug:{type:D.STRING(160),allowNull:false,unique:true},status:{type:D.ENUM("ACTIVE","INACTIVE"),allowNull:false,defaultValue:"ACTIVE"},sort_order:{type:D.INTEGER,allowNull:false,defaultValue:0},icon_key:D.STRING(80)},{tableName:"help_categories",timestamps:true});

app/models/help/helpCategoryTranslation.model.js

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+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"]}]});