Add pagination support to GET /api/v1/habits endpoint

- Create pagination package with Params and Response structs
- Add FindActiveByUserIDWithPagination and CountActiveByUserID methods to HabitRepository interface
- Implement pagination in SQLite repository using LIMIT and OFFSET
- Update GetUserHabitsHandler to support optional pagination parameters
- Modify HTTP endpoint to parse 'page' and 'page_size' query params (default: page=1, page_size=50, max=100)
- Add GetUserHabitsResponse DTO with pagination metadata
- Maintain backward compatibility - endpoint works with and without pagination params
- Add comprehensive tests for pagination logic in repository, handler, and pagination package
- Update all mock repositories to implement new pagination methods

internal/infrastructure/http/dto.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	"apocapoc-api/internal/domain/value_objects"
+	"apocapoc-api/internal/shared/pagination"
 )
 
 type CreateHabitRequest struct {
@@ -76,6 +77,11 @@ type UserHabitResponse struct {
 	IsNegative   bool                    `json:"is_negative"`
 }
 
+type GetUserHabitsResponse struct {
+	Data       []UserHabitResponse  `json:"data"`
+	Pagination *pagination.Response `json:"pagination,omitempty"`
+}
+
 type HabitEntryResponse struct {
 	ID            string    `json:"id"`
 	HabitID       string    `json:"habit_id"`