leads: new phone number and an amoCRM lead on every call-button click

The published number becomes +7 927 789-60-71 across all four landings —
`contacts` in each `src/data/content.ts`, plus the fallback messages in the
lead endpoints and `src/lib/lead.ts` that spell it out when amoCRM is down.
The `legacy/` reference pages keep the old number: they are the visual
originals, not something that ships.

Tapping the phone button now also creates a lead. It cannot reuse the form
path: a click carries no name and no number, so `callClickSchema` in
`shared/lead.ts` validates the tracking data alone, `LeadService.submitCallClick`
creates a contactless lead tagged `клик по телефону`, and `AmoClient.createLead`
takes an optional `contactId` for it. The mapper's field/note split moved into
`collect()` so both lead kinds share it.

The browser fires this with `sendBeacon` (falling back to `fetch keepalive`),
because the same click hands the page to `tel:` and a plain fetch would be
cut off mid-flight. Duplicates are held down from both ends: one lead per
browser session on the client, four per IP per 30 minutes on the server.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

hotel/src/components/SiteHeader.tsx

@@ -2,6 +2,7 @@ import type { RefObject } from 'react'
 import logo from '../assets/images/exo-logo.png'
 import { contacts, navLinks } from '../data/content'
 import { cx } from '../lib/cx'
+import { reportCallClick } from '../lib/lead'
 import { ButtonLink, buttonClass, headerSize } from './Button'
 import { PhoneIcon } from './Icons'
 import { Container } from './Layout'
@@ -40,6 +41,7 @@ export function SiteHeader({ scrolled, headerRef }: { scrolled: boolean; headerR
         <div className="flex shrink-0 items-center gap-[10px] compact:gap-[6px]">
           <a
             href={contacts.phoneHref}
+            onClick={reportCallClick}
             aria-label="Позвонить в Экзо Групп"
             className={buttonClass('call', 'compact:px-[12px]', headerSize)}
           >