feat(09-01): add quote validators and service layer for Phase 9 quote builder

- Updated quotes table schema: added accepted_total, state, client_email, client_notes fields
- Updated quote_items relations: changed service_id FK to unified services table
- Created quote-validators.ts: Zod schemas for quote creation, acceptance, and step validation
- Created quote-service.ts: public query layer (excludes line items) and admin queries
- Added Phase 9 migration: additive columns for quotes state machine and client capture
- Maintained backward compatibility: legacy quote_items tied to projects remain functional
- TypeScript builds successfully with no errors

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/lib/quote-validators.ts

@@ -0,0 +1,25 @@
+import { z } from "zod";
+
+// Quote creation (admin builder)
+export const createQuoteSchema = z.object({
+  client_id: z.string().min(1, "Cliente richiesto"),
+  offer_micro_id: z.string().min(1, "Offerta richiesta"),
+  accepted_total: z.string().regex(/^\d+(\.\d{1,2})?$/, "Formato prezzo invalido"),
+});
+
+// Quote accept (public page, Step 3)
+export const acceptQuoteSchema = z.object({
+  token: z.string().length(21, "Token invalido"),
+  email: z.string().email("Email valida").optional().or(z.literal("")),
+  notes: z.string().max(500, "Max 500 caratteri").optional().or(z.literal("")),
+});
+
+// Quote step validation (public page Steps 1-2)
+export const quoteStep2Schema = z.object({
+  tier: z.enum(["A", "B", "C"]).optional(),
+  priceOverrides: z.record(z.string(), z.number().min(0)).optional(),
+});
+
+export type CreateQuoteInput = z.infer<typeof createQuoteSchema>;
+export type AcceptQuoteInput = z.infer<typeof acceptQuoteSchema>;
+export type QuoteStep2Input = z.infer<typeof quoteStep2Schema>;