fix(04-06): five post-deploy fixes

- Middleware (proxy.ts): switch internal API calls to localhost instead of
  request.url — avoids Docker hairpin NAT issues where the container can't
  reach its own external hostname via Traefik
- ProjectRow timer: pass projectId={project.id} to TimerCell so it calls
  startTimer(projectId) directly instead of startTimerForClient(project.id)
- Admin client list: add slug field to ClientWithPayments + show slug link
  when available (falls back to token) — so admins see the human-readable URL
- Analytics contracted: sum projects.accepted_total (authoritative) instead
  of clients.accepted_total (always 0 in multi-project architecture)
- createClient: auto-generate slug from client name at creation time
  (e.g. "Mario Rossi" → "mario-rossi"), with -2/-3 suffix on conflict

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

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

@@ -3,9 +3,30 @@
 import { redirect } from "next/navigation";
 import { revalidatePath } from "next/cache";
 import { z } from "zod";
+import { eq } from "drizzle-orm";
 import { db } from "@/db";
 import { clients, projects, payments } from "@/db/schema";
 
+function toSlug(name: string): string {
+  return name
+    .toLowerCase()
+    .normalize("NFD")
+    .replace(/[̀-ͯ]/g, "")
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+|-+$/g, "")
+    .slice(0, 50);
+}
+
+async function uniqueSlug(base: string): Promise<string | null> {
+  if (base.length < 3) return null;
+  const candidates = [base, ...Array.from({ length: 8 }, (_, i) => `${base.slice(0, 47)}-${i + 2}`)];
+  for (const candidate of candidates) {
+    const rows = await db.select({ id: clients.id }).from(clients).where(eq(clients.slug, candidate)).limit(1);
+    if (rows.length === 0) return candidate;
+  }
+  return null;
+}
+
 const createClientSchema = z.object({
   name: z.string().min(1, "Nome richiesto"),
   brand_name: z.string().min(1, "Nome brand richiesto"),
@@ -26,6 +47,9 @@ export async function createClient(formData: FormData) {
     );
   }
 
+  // Auto-generate slug from name (e.g. "Mario Rossi" → "mario-rossi")
+  const slug = await uniqueSlug(toSlug(parsed.data.name));
+
   // Insert client — token and id are auto-generated by $defaultFn(() => nanoid())
   const [newClient] = await db
     .insert(clients)
@@ -33,6 +57,7 @@ export async function createClient(formData: FormData) {
       name: parsed.data.name,
       brand_name: parsed.data.brand_name,
       brief: parsed.data.brief,
+      slug,
     })
     .returning({ id: clients.id, token: clients.token, brand_name: clients.brand_name });