Rebrand from MyCrib to Casera

- Update Go module from mycrib-api to casera-api
- Update all import statements across 69 Go files
- Update admin panel branding (title, sidebar, login form)
- Update email templates (subjects, bodies, signatures)
- Update PDF report generation branding
- Update Docker container names and network
- Update config defaults (database name, email sender, APNS topic)
- Update README and documentation

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

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

internal/middleware/admin_auth.go

@@ -9,9 +9,9 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/golang-jwt/jwt/v5"
 
-	"github.com/treytartt/mycrib-api/internal/config"
-	"github.com/treytartt/mycrib-api/internal/models"
-	"github.com/treytartt/mycrib-api/internal/repositories"
+	"github.com/treytartt/casera-api/internal/config"
+	"github.com/treytartt/casera-api/internal/models"
+	"github.com/treytartt/casera-api/internal/repositories"
 )
 
 const (

internal/middleware/auth.go

@@ -12,8 +12,8 @@ import (
 	"github.com/rs/zerolog/log"
 	"gorm.io/gorm"
 
-	"github.com/treytartt/mycrib-api/internal/models"
-	"github.com/treytartt/mycrib-api/internal/services"
+	"github.com/treytartt/casera-api/internal/models"
+	"github.com/treytartt/casera-api/internal/services"
 )
 
 const (