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/requests/task.go

@@ -1,11 +1,57 @@
 package requests
 
 import (
+	"encoding/json"
+	"strings"
 	"time"
 
 	"github.com/shopspring/decimal"
 )
 
+// FlexibleDate handles both "2025-11-27" and "2025-11-27T00:00:00Z" formats
+type FlexibleDate struct {
+	time.Time
+}
+
+func (fd *FlexibleDate) UnmarshalJSON(data []byte) error {
+	// Remove quotes
+	s := strings.Trim(string(data), "\"")
+	if s == "" || s == "null" {
+		return nil
+	}
+
+	// Try RFC3339 first (full datetime)
+	t, err := time.Parse(time.RFC3339, s)
+	if err == nil {
+		fd.Time = t
+		return nil
+	}
+
+	// Try date-only format
+	t, err = time.Parse("2006-01-02", s)
+	if err == nil {
+		fd.Time = t
+		return nil
+	}
+
+	return err
+}
+
+func (fd FlexibleDate) MarshalJSON() ([]byte, error) {
+	if fd.Time.IsZero() {
+		return json.Marshal(nil)
+	}
+	return json.Marshal(fd.Time.Format(time.RFC3339))
+}
+
+// ToTimePtr returns a pointer to the underlying time, or nil if zero
+func (fd *FlexibleDate) ToTimePtr() *time.Time {
+	if fd == nil || fd.Time.IsZero() {
+		return nil
+	}
+	return &fd.Time
+}
+
 // CreateTaskRequest represents the request to create a task
 type CreateTaskRequest struct {
 	ResidenceID   uint             `json:"residence_id" binding:"required"`
@@ -16,7 +62,7 @@ type CreateTaskRequest struct {
 	StatusID      *uint            `json:"status_id"`
 	FrequencyID   *uint            `json:"frequency_id"`
 	AssignedToID  *uint            `json:"assigned_to_id"`
-	DueDate       *time.Time       `json:"due_date"`
+	DueDate       *FlexibleDate    `json:"due_date"`
 	EstimatedCost *decimal.Decimal `json:"estimated_cost"`
 	ContractorID  *uint            `json:"contractor_id"`
 }
@@ -30,7 +76,7 @@ type UpdateTaskRequest struct {
 	StatusID      *uint            `json:"status_id"`
 	FrequencyID   *uint            `json:"frequency_id"`
 	AssignedToID  *uint            `json:"assigned_to_id"`
-	DueDate       *time.Time       `json:"due_date"`
+	DueDate       *FlexibleDate    `json:"due_date"`
 	EstimatedCost *decimal.Decimal `json:"estimated_cost"`
 	ActualCost    *decimal.Decimal `json:"actual_cost"`
 	ContractorID  *uint            `json:"contractor_id"`