feat: trash (soft delete) with admin tool management

- tools: add deletedAt/deletedBy, soft delete via DELETE /tools/:id when
  actor has trash entitlement, else immediate hard delete
- trash endpoints: GET /tools/trash, POST /tools/trash (admin bulk),
  POST /tools/trash/restore, DELETE /tools/trash, POST /tools/trash/empty
- trash feature for premium/enterprise; exclude trashed from all public
  surfaces (browse, categories, features, tags, similar, ratings, costs,
  analytics, redundancy)
- TRASH_RETENTION_DAYS env (0 = keep forever) with hourly purge job
- frontend: /trash page (premium+, restore for all, permanent delete +
  empty for admin), admin Tools tab with multi-select bulk trash,
  sidebar Trash link, tool-detail delete hint

lib/db/src/schema/tools.ts

@@ -14,6 +14,8 @@ export const toolsTable = pgTable("tools", {
   tags: text("tags").array().notNull().default([]),
   createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
   updatedAt: timestamp("updated_at", { withTimezone: true }).notNull().defaultNow().$onUpdate(() => new Date()),
+  deletedAt: timestamp("deleted_at", { withTimezone: true }),
+  deletedBy: text("deleted_by"),
 });
 
 export const insertToolSchema = createInsertSchema(toolsTable).omit({ id: true, createdAt: true, updatedAt: true });