Add PDF reports, file uploads, admin auth, and comprehensive tests

Features:
- PDF service for generating task reports with ReportLab-style formatting
- Storage service for file uploads (local and S3-compatible)
- Admin authentication middleware with JWT support
- Admin user model and repository

Infrastructure:
- Updated Docker configuration for admin panel builds
- Email service enhancements for task notifications
- Updated router with admin and file upload routes
- Environment configuration updates

Tests:
- Unit tests for handlers (auth, residence, task)
- Unit tests for models (user, residence, task)
- Unit tests for repositories (user, residence, task)
- Unit tests for services (residence, task)
- Integration test setup
- Test utilities for mocking database and services

Database:
- Admin user seed data
- Updated test data seeds

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

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

internal/dto/responses/contractor.go

@@ -28,6 +28,7 @@ type ContractorResponse struct {
 	ID            uint                          `json:"id"`
 	ResidenceID   uint                          `json:"residence_id"`
 	CreatedByID   uint                          `json:"created_by_id"`
+	AddedBy       uint                          `json:"added_by"` // Alias for created_by_id (KMM compatibility)
 	CreatedBy     *ContractorUserResponse       `json:"created_by,omitempty"`
 	Name          string                        `json:"name"`
 	Company       string                        `json:"company"`
@@ -48,13 +49,7 @@ type ContractorResponse struct {
 	UpdatedAt     time.Time                     `json:"updated_at"`
 }
 
-// ContractorListResponse represents a paginated list of contractors
-type ContractorListResponse struct {
-	Count    int                  `json:"count"`
-	Next     *string              `json:"next"`
-	Previous *string              `json:"previous"`
-	Results  []ContractorResponse `json:"results"`
-}
+// Note: Pagination removed - list endpoints now return arrays directly
 
 // ToggleFavoriteResponse represents the response after toggling favorite
 type ToggleFavoriteResponse struct {
@@ -94,6 +89,7 @@ func NewContractorResponse(c *models.Contractor) ContractorResponse {
 		ID:            c.ID,
 		ResidenceID:   c.ResidenceID,
 		CreatedByID:   c.CreatedByID,
+		AddedBy:       c.CreatedByID, // Alias for KMM compatibility
 		Name:          c.Name,
 		Company:       c.Company,
 		Phone:         c.Phone,
@@ -124,16 +120,11 @@ func NewContractorResponse(c *models.Contractor) ContractorResponse {
 	return resp
 }
 
-// NewContractorListResponse creates a ContractorListResponse from a slice of contractors
-func NewContractorListResponse(contractors []models.Contractor) ContractorListResponse {
+// NewContractorListResponse creates a list of contractor responses
+func NewContractorListResponse(contractors []models.Contractor) []ContractorResponse {
 	results := make([]ContractorResponse, len(contractors))
 	for i, c := range contractors {
 		results[i] = NewContractorResponse(&c)
 	}
-	return ContractorListResponse{
-		Count:    len(contractors),
-		Next:     nil,
-		Previous: nil,
-		Results:  results,
-	}
+	return results
 }