Convert medical-centre landing to React + Tailwind v4 with amoCRM lead capture

Ports the single-file MedCsFiz page — the medical centre that already runs
physiotherapy and wants the existing room to earn more — to the same
architecture as the fitness and hotel landings: Vite + React 19 + TypeScript +
Tailwind v4 on the client, Express 5 for the API, zod schema shared between the
two.

The original stays in legacy/index.html as the visual reference. Its 4 MB of
inlined CSS, JS and base64 images become 12 asset files (664 KB) plus a bundle
loaded on demand; the two 1.5 MB / 750 KB device PNGs are recompressed to webp.
The page is split into 18 components with all copy moved to src/data/content.ts.

Leads reuse the fitness amoCRM integration: contact lookup by phone in every
Russian spelling, deal in the first stage of pipeline 10980758, account fields
matched automatically with the rest written to a note. Rate limit, honeypot and
a localStorage fallback so a lead survives the CRM being down. Endpoint is
/api/leads/medical-centers-existing-physio; Vite runs on 5173 and the API on
3000.

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

medcenter/server/src/config.ts

@@ -0,0 +1,58 @@
+import { config as loadEnv } from 'dotenv'
+
+loadEnv()
+
+function optional(name: string): string | undefined {
+  const value = process.env[name]?.trim()
+  return value ? value : undefined
+}
+
+function optionalNumber(name: string): number | undefined {
+  const raw = optional(name)
+  if (raw === undefined) return undefined
+  const value = Number(raw)
+  if (!Number.isFinite(value)) throw new Error(`${name} must be a number, got "${raw}"`)
+  return value
+}
+
+/**
+ * amoCRM settings. Deliberately not throwing when they are missing: the site
+ * must still boot and serve pages without a CRM connection — only the lead
+ * endpoint degrades, and it says so explicitly.
+ */
+export interface AmoConfig {
+  baseUrl: string
+  token: string
+  pipelineId: number
+  responsibleUserId?: number
+  tags: string[]
+}
+
+export function readAmoConfig(): AmoConfig | null {
+  const subdomain = optional('AMO_SUBDOMAIN')
+  const token = optional('AMO_LONG_LIVED_TOKEN')
+  if (!subdomain || !token) return null
+
+  // Accepts "exotherapy", "exotherapy.amocrm.ru", or a full URL (an explicit
+  // scheme is kept as-is, which is what local mocks and self-hosted setups need).
+  const host = subdomain.replace(/\/+$/, '')
+  const baseUrl = /^https?:\/\//.test(host)
+    ? host
+    : `https://${host.includes('.') ? host : `${host}.${optional('AMO_DOMAIN') ?? 'amocrm.ru'}`}`
+
+  return {
+    baseUrl,
+    token,
+    pipelineId: optionalNumber('AMO_PIPELINE_ID') ?? 10980758,
+    responsibleUserId: optionalNumber('AMO_RESPONSIBLE_USER_ID'),
+    tags: (optional('AMO_LEAD_TAGS') ?? '')
+      .split(',')
+      .map((t) => t.trim())
+      .filter(Boolean),
+  }
+}
+
+export const serverConfig = {
+  port: optionalNumber('PORT') ?? 3000,
+  isProduction: process.env.NODE_ENV === 'production',
+}