feat(templates): consolidate admin and profile templates

Add admin_users.templ for user management interface with delete, password
reset, and edit capabilities. Add profile.templ and related components for
user profile management. Remove admin_profile.templ. Update all templates
to use new consolidated API endpoints.

templates/types.go

@@ -1,13 +1,20 @@
 package templates
 
-import "github.com/a-h/templ"
+import (
+	"time"
+
+	"github.com/a-h/templ"
+)
 
 type User struct {
-	ID       string
-	Username string
-	Email    string
-	Role     string
-	Theme    string
+	ID        string
+	Username  string
+	Email     string
+	Role      string
+	Theme     string
+	FirstName string
+	LastName  string
+	CreatedAt time.Time
 }
 
 type PageData struct {