Rebrand from Casera/MyCrib to honeyDue

Total rebrand across all Go API source files:
- Go module path: casera-api -> honeydue-api
- All imports updated (130+ files)
- Docker: containers, images, networks renamed
- Email templates: support email, noreply, icon URL
- Domains: casera.app/mycrib.treytartt.com -> honeyDue.treytartt.com
- Bundle IDs: com.tt.casera -> com.tt.honeyDue
- IAP product IDs updated
- Landing page, admin panel, config defaults
- Seeds, CI workflows, Makefile, docs
- Database table names preserved (no migration needed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/TASK_KANBAN_CATEGORIZATION.md

@@ -1,6 +1,6 @@
 # Task Kanban Categorization
 
-This document explains how tasks are categorized into kanban columns in the Casera application.
+This document explains how tasks are categorized into kanban columns in the honeyDue application.
 
 > Note: The categorization chain still computes `cancelled_tasks`, but the kanban board response
 > intentionally hides cancelled/archived tasks and returns only 5 visible columns.
@@ -245,7 +245,7 @@ Each column has associated metadata for UI rendering:
 ### Basic Categorization
 
 ```go
-import "github.com/treytartt/casera-api/internal/task/categorization"
+import "github.com/treytartt/honeydue-api/internal/task/categorization"
 
 task := &models.Task{
     DueDate:    time.Now().AddDate(0, 0, 15), // 15 days from now