Add tags support for domains with filtering and bulk actions

Introduces a 'tags' field to the domains table and UI, allowing users to organize domains with custom tags. Adds tag input and display to create, edit, bulk-add, and view pages, as well as tag-based filtering and bulk tag management (add/remove) in the domain list. Updates backend validation, controller logic, and migrations to support tags, including a new migration and index for efficient tag searches.

database/migrations/000_initial_schema_v1.1.0.sql

@@ -28,6 +28,7 @@ CREATE TABLE IF NOT EXISTS domains (
     status ENUM('active', 'expiring_soon', 'expired', 'error', 'available') DEFAULT 'active',
     whois_data JSON,
     notes TEXT,
+    tags TEXT NULL COMMENT 'Comma-separated tags for organization',
     is_active BOOLEAN DEFAULT TRUE,
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
@@ -36,7 +37,8 @@ CREATE TABLE IF NOT EXISTS domains (
     INDEX idx_domain_name (domain_name),
     INDEX idx_expiration_date (expiration_date),
     INDEX idx_status (status),
-    INDEX idx_is_active (is_active)
+    INDEX idx_is_active (is_active),
+    INDEX idx_tags (tags(255))
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 -- Notification channels table