feat(21-22): agente AI generazione preventivo + pagina pubblica deck

- Migration 0010: tabella proposals (id, slug, lead_id, client_id,
  offer_macro_id, content jsonb, state, selected_tier, accepted_at)
  applicata a prod via SSH tunnel
- @anthropic-ai/sdk@0.105.0 installato; ANTHROPIC_API_KEY in .env.local
- src/lib/proposal/: schema Zod ProposalContent, agente Claude Opus 4.8,
  assemble (AI + offerta DB + config consulente), queries, profile.ts
- Admin: /admin/preventivi lista + /genera (pre-fill ?lead_id=X) + /[id] review
- Sidebar: voce Preventivi + CTA globale lime "Genera preventivo"
- LeadDetail: pulsante "Genera preventivo" → /admin/preventivi/genera?lead_id=X
- Pagina pubblica /preventivo/[slug]: deck 20+ slide light-mode iamcavalli,
  navigazione frecce + dot + keyboard, accept/reject con guard immutabilità
- STATE.md aggiornato (80%), 21-PLAN.md scritto nel formato GSD

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

src/db/schema.ts

@@ -5,6 +5,7 @@ import {
   numeric,
   timestamp,
   boolean,
+  jsonb,
   primaryKey,
   uniqueIndex,
   index,
@@ -518,11 +519,46 @@ export const clientTranscripts = pgTable("client_transcripts", {
     .defaultNow(),
 });
 
+// ============ PROPOSALS TABLE (Preventivo AI — Phase 21/22) ============
+// Preventivo generato dall'agente AI e pubblicato come pagina pubblica
+// navigabile su /preventivo/[slug]. content (jsonb) contiene l'intero
+// ProposalContent assemblato (sezioni AI + offerta + config consulente).
+// lead_id/client_id nullable (ON DELETE SET NULL — non perdere la proposta se
+// il lead viene rimosso). offer_macro_id RESTRICT — la proposta riferisce
+// l'offerta sorgente. accepted_at IMMUTABILE una volta valorizzato.
+export const proposals = pgTable("proposals", {
+  id: text("id")
+    .primaryKey()
+    .$defaultFn(() => nanoid()),
+  slug: text("slug")
+    .notNull()
+    .unique()
+    .$defaultFn(() => nanoid()),
+  lead_id: text("lead_id").references(() => leads.id, { onDelete: "set null" }),
+  client_id: text("client_id").references(() => clients.id, { onDelete: "set null" }),
+  offer_macro_id: text("offer_macro_id")
+    .notNull()
+    .references(() => offer_macros.id, { onDelete: "restrict" }),
+  title: text("title"),
+  // Intero ProposalContent assemblato. Validato a runtime via Zod
+  // (src/lib/proposal/schema.ts); jsonb gestito da postgres-js (parse automatico).
+  content: jsonb("content").notNull(),
+  model: text("model"), // es. "claude-opus-4-8"
+  state: text("state").notNull().default("draft"), // draft | published | accepted | rejected
+  selected_tier: text("selected_tier"), // 'A' | 'B' | 'C' — CHECK a livello SQL (migration 0010)
+  accepted_at: timestamp("accepted_at", { withTimezone: true }), // immutable once set
+  client_email: text("client_email"),
+  client_notes: text("client_notes"),
+  created_at: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
+  updated_at: timestamp("updated_at", { withTimezone: true }).notNull().defaultNow(),
+});
+
 // ============ RELATIONS ============
 
 export const clientsRelations = relations(clients, ({ many }) => ({
   projects: many(projects),
   transcripts: many(clientTranscripts),
+  proposals: many(proposals),
 }));
 
 export const projectsRelations = relations(projects, ({ one, many }) => ({
@@ -654,6 +690,7 @@ export const leadsRelations = relations(leads, ({ many }) => ({
   activities: many(activities),
   reminders: many(reminders),
   transcripts: many(clientTranscripts),
+  proposals: many(proposals),
 }));
 
 export const activitiesRelations = relations(activities, ({ one }) => ({
@@ -682,6 +719,15 @@ export const quotesRelations = relations(quotes, ({ one, many }) => ({
   quoteItems: many(quote_items),
 }));
 
+export const proposalsRelations = relations(proposals, ({ one }) => ({
+  lead: one(leads, { fields: [proposals.lead_id], references: [leads.id] }),
+  client: one(clients, { fields: [proposals.client_id], references: [clients.id] }),
+  offerMacro: one(offer_macros, {
+    fields: [proposals.offer_macro_id],
+    references: [offer_macros.id],
+  }),
+}));
+
 // ============ TYPESCRIPT TYPES (for use in API routes and Server Components) ============
 
 export type Client = typeof clients.$inferSelect;
@@ -739,4 +785,6 @@ export type NewActivity = typeof activities.$inferInsert;
 export type Reminder = typeof reminders.$inferSelect;
 export type NewReminder = typeof reminders.$inferInsert;
 export type ClientTranscript = typeof clientTranscripts.$inferSelect;
-export type NewClientTranscript = typeof clientTranscripts.$inferInsert;
+export type NewClientTranscript = typeof clientTranscripts.$inferInsert;
+export type Proposal = typeof proposals.$inferSelect;
+export type NewProposal = typeof proposals.$inferInsert;