feat(04-01): multi-project schema migration — projects, settings, FK pivot

- schema.ts: add projects table, settings kv table, slug on clients;
  migrate 6 FK from client_id to project_id (phases, payments, documents, notes,
  time_entries, quote_items); update all relations and TypeScript types
- admin-queries.ts: fix getAllClientsWithPayments + getClientFullDetail to aggregate
  through projects; add getAllProjectsWithPayments, getProjectFullDetail,
  getClientWithProjects, ClientWithProjects type
- settings.ts: new file — getSetting, updateSetting, getTargetHourlyRate, SETTINGS_KEYS
- Fix all downstream files: actions.ts, quote-actions.ts, new/actions.ts,
  timer-actions.ts, approve/route.ts, comment/route.ts, TimerCell.tsx,
  analytics-queries.ts, client-view.ts, seed.ts
- DB migration applied to Coolify Postgres (all test data cleared, schema rebuilt)

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

src/app/admin/clients/new/actions.ts

@@ -4,7 +4,7 @@ import { redirect } from "next/navigation";
 import { revalidatePath } from "next/cache";
 import { z } from "zod";
 import { db } from "@/db";
-import { clients, payments } from "@/db/schema";
+import { clients, projects, payments } from "@/db/schema";
 
 const createClientSchema = z.object({
   name: z.string().min(1, "Nome richiesto"),
@@ -21,7 +21,6 @@ export async function createClient(formData: FormData) {
 
   const parsed = createClientSchema.safeParse(raw);
   if (!parsed.success) {
-    // In v1 return errors as thrown string — form displays validation inline
     throw new Error(
       parsed.error.issues.map((i) => i.message).join(", ")
     );
@@ -35,19 +34,27 @@ export async function createClient(formData: FormData) {
       brand_name: parsed.data.brand_name,
       brief: parsed.data.brief,
     })
-    .returning({ id: clients.id, token: clients.token });
+    .returning({ id: clients.id, token: clients.token, brand_name: clients.brand_name });
 
-  // Always create two payment stubs per client — Acconto 50% and Saldo 50%
-  // Amounts default to 0 until admin sets accepted_total; admin updates separately
+  // Create a default project for the client — all work items are project-scoped
+  const [newProject] = await db
+    .insert(projects)
+    .values({
+      client_id: newClient.id,
+      name: newClient.brand_name,
+    })
+    .returning({ id: projects.id });
+
+  // Always create two payment stubs per project — Acconto 50% and Saldo 50%
   await db.insert(payments).values([
     {
-      client_id: newClient.id,
+      project_id: newProject.id,
       label: "Acconto 50%",
       amount: "0",
       status: "da_saldare",
     },
     {
-      client_id: newClient.id,
+      project_id: newProject.id,
       label: "Saldo 50%",
       amount: "0",
       status: "da_saldare",