feat(perms): re-add projects.create permission (migration + seed)

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

prisma/migrations/20260606120000_add_projects_create_permission/migration.sql

@@ -0,0 +1,15 @@
+-- Re-add the projects.create permission (removed in commit 82919d3 when manual
+-- project creation was deleted). Idempotent: re-running is a no-op.
+-- Mirrors prisma/seed.ts PERMISSIONS exactly (name, display_name, module, description).
+
+-- 1. Insert the permission (INSERT IGNORE skips on duplicate name).
+INSERT IGNORE INTO `permissions` (`name`, `display_name`, `module`, `description`, `created_at`) VALUES
+  ('projects.create', 'Vytvořit projekt', 'projects', 'Ručně vytvářet projekty', NOW());
+
+-- 2. Grant it to the admin role (idempotent via composite PK).
+INSERT IGNORE INTO `role_permissions` (`role_id`, `permission_id`)
+SELECT r.id, p.id
+FROM   `roles` r
+CROSS  JOIN `permissions` p
+WHERE  r.name = 'admin'
+  AND  p.name IN ('projects.create');