feat: Implement Phase 8 Delivery and Rider Management

- Introduced new Delivery and Rider API documentation.
- Added new models for RiderProfile, Shipment, ShipmentItem, ShipmentAssignment, ShipmentEvent, and ShipmentProof.
- Developed controllers for admin and rider logistics, including shipment management and rider actions.
- Created services for handling shipment creation, assignment, and state transitions.
- Implemented validation schemas for shipment and rider operations.
- Added new routes for admin and rider logistics, including tracking endpoints.
- Established a state machine for shipment status transitions.
- Created migration scripts for new database tables and relationships.
- Added unit tests for shipment state transitions and validation security.

app/models/logistics/shipmentItem.model.js

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+module.exports=(s,D)=>{const M=s.define("ShipmentItem",{id:{type:D.STRING,primaryKey:true},shipment_id:{type:D.STRING,allowNull:false},order_item_id:{type:D.STRING,allowNull:false},quantity:{type:D.INTEGER,allowNull:false}},{tableName:"shipment_items",timestamps:true,indexes:[{unique:true,fields:["shipment_id","order_item_id"]}]});M.associate=db=>M.belongsTo(db.Shipment,{foreignKey:"shipment_id",as:"shipment"});return M;};