feat: centralized Notion-style taxonomy management in settings

Single persistent option pool per taxonomy (7 fields: offer
categoria/ticket/tipo/obiettivo + catalog fase/offerta/pacchetto),
stored as JSON in the settings table (no DB migration).

- src/lib/taxonomy.ts: pools with lazy seed from in-use values,
  add/remove(cascade)/rename helpers
- Inline creation anywhere registers into the pool (save offer,
  addServiceOption, updateServiceField fase, quickAdd, create macro)
- Deselecting on a row never touches the pool; global delete only
  from settings (cascade-strips tags / nulls columns)
- getOfferFieldOptions + getCatalogFieldOptions read from pools
- Settings: TaxonomyManager (offer + catalog groups), confirm on delete

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/admin-queries.ts

@@ -24,6 +24,7 @@ import {
   tags,
 } from "@/db/schema";
 import { eq, inArray, asc, desc, isNull, sql, and } from "drizzle-orm";
+import { getPool } from "@/lib/taxonomy";
 import { LEAD_STAGES } from "@/lib/lead-validators";
 import type {
   Client,
@@ -420,32 +421,21 @@ export type CatalogFieldOptions = {
 };
 
 export async function getCatalogFieldOptions(): Promise<CatalogFieldOptions> {
-  const tagRows = await db
-    .selectDistinct({ name: tags.name, type: tags.entity_type })
-    .from(tags)
-    .where(inArray(tags.entity_type, [TAG_ENTITY, PACCHETTO_ENTITY]));
+  // fase / Offerta (tag) / Pacchetto read from the centralized, persistent
+  // taxonomy pools (src/lib/taxonomy.ts). `categoria` (services.category) is
+  // hidden in the catalog UI and stays derived from in-use values.
+  const [tag, pacchetto, fase, catRows] = await Promise.all([
+    getPool("service_offerta"),
+    getPool("service_pacchetto"),
+    getPool("service_fase"),
+    db.selectDistinct({ value: services.category }).from(services),
+  ]);
 
-  // Distinct category / fase values (single-select pools); nulls filtered below.
-  const catRows = await db
-    .selectDistinct({ value: services.category })
-    .from(services);
-  const faseRows = await db
-    .selectDistinct({ value: services.fase })
-    .from(services);
+  const categoria = Array.from(
+    new Set(catRows.map((r) => r.value).filter((v): v is string => !!v && v.trim().length > 0))
+  ).sort((a, b) => a.localeCompare(b, "it"));
 
-  const sortUnique = (arr: (string | null)[]) =>
-    Array.from(new Set(arr.filter((v): v is string => !!v && v.trim().length > 0))).sort(
-      (a, b) => a.localeCompare(b, "it")
-    );
-
-  return {
-    tag: sortUnique(tagRows.filter((r) => r.type === TAG_ENTITY).map((r) => r.name)),
-    pacchetto: sortUnique(
-      tagRows.filter((r) => r.type === PACCHETTO_ENTITY).map((r) => r.name)
-    ),
-    categoria: sortUnique(catRows.map((r) => r.value)),
-    fase: sortUnique(faseRows.map((r) => r.value)),
-  };
+  return { tag, pacchetto, categoria, fase };
 }
 
 // ── ProjectWithPayments — used by /admin/projects list ───────────────────────