Initial commit: MyCrib API in Go

Complete rewrite of Django REST API to Go with:
- Gin web framework for HTTP routing
- GORM for database operations
- GoAdmin for admin panel
- Gorush integration for push notifications
- Redis for caching and job queues

Features implemented:
- User authentication (login, register, logout, password reset)
- Residence management (CRUD, sharing, share codes)
- Task management (CRUD, kanban board, completions)
- Contractor management (CRUD, specialties)
- Document management (CRUD, warranties)
- Notifications (preferences, push notifications)
- Subscription management (tiers, limits)

Infrastructure:
- Docker Compose for local development
- Database migrations and seed data
- Admin panel for data management

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/models/document.go

@@ -0,0 +1,75 @@
+package models
+
+import (
+	"time"
+
+	"github.com/shopspring/decimal"
+)
+
+// DocumentType represents the type of document
+type DocumentType string
+
+const (
+	DocumentTypeGeneral   DocumentType = "general"
+	DocumentTypeWarranty  DocumentType = "warranty"
+	DocumentTypeReceipt   DocumentType = "receipt"
+	DocumentTypeContract  DocumentType = "contract"
+	DocumentTypeInsurance DocumentType = "insurance"
+	DocumentTypeManual    DocumentType = "manual"
+)
+
+// Document represents the task_document table
+type Document struct {
+	BaseModel
+	ResidenceID   uint             `gorm:"column:residence_id;index;not null" json:"residence_id"`
+	Residence     Residence        `gorm:"foreignKey:ResidenceID" json:"-"`
+	CreatedByID   uint             `gorm:"column:created_by_id;index;not null" json:"created_by_id"`
+	CreatedBy     User             `gorm:"foreignKey:CreatedByID" json:"created_by,omitempty"`
+
+	Title         string           `gorm:"column:title;size:200;not null" json:"title"`
+	Description   string           `gorm:"column:description;type:text" json:"description"`
+	DocumentType  DocumentType     `gorm:"column:document_type;size:20;default:'general'" json:"document_type"`
+
+	// File information
+	FileURL       string           `gorm:"column:file_url;size:500" json:"file_url"`
+	FileName      string           `gorm:"column:file_name;size:255" json:"file_name"`
+	FileSize      *int64           `gorm:"column:file_size" json:"file_size"`
+	MimeType      string           `gorm:"column:mime_type;size:100" json:"mime_type"`
+
+	// Warranty-specific fields
+	PurchaseDate  *time.Time       `gorm:"column:purchase_date;type:date" json:"purchase_date"`
+	ExpiryDate    *time.Time       `gorm:"column:expiry_date;type:date;index" json:"expiry_date"`
+	PurchasePrice *decimal.Decimal `gorm:"column:purchase_price;type:decimal(10,2)" json:"purchase_price"`
+	Vendor        string           `gorm:"column:vendor;size:200" json:"vendor"`
+	SerialNumber  string           `gorm:"column:serial_number;size:100" json:"serial_number"`
+	ModelNumber   string           `gorm:"column:model_number;size:100" json:"model_number"`
+
+	// Associated task (optional)
+	TaskID        *uint            `gorm:"column:task_id;index" json:"task_id"`
+	Task          *Task            `gorm:"foreignKey:TaskID" json:"task,omitempty"`
+
+	// State
+	IsActive      bool             `gorm:"column:is_active;default:true;index" json:"is_active"`
+}
+
+// TableName returns the table name for GORM
+func (Document) TableName() string {
+	return "task_document"
+}
+
+// IsWarrantyExpiringSoon returns true if the warranty expires within the specified days
+func (d *Document) IsWarrantyExpiringSoon(days int) bool {
+	if d.DocumentType != DocumentTypeWarranty || d.ExpiryDate == nil {
+		return false
+	}
+	threshold := time.Now().UTC().AddDate(0, 0, days)
+	return d.ExpiryDate.Before(threshold) && d.ExpiryDate.After(time.Now().UTC())
+}
+
+// IsWarrantyExpired returns true if the warranty has expired
+func (d *Document) IsWarrantyExpired() bool {
+	if d.DocumentType != DocumentTypeWarranty || d.ExpiryDate == nil {
+		return false
+	}
+	return time.Now().UTC().After(*d.ExpiryDate)
+}