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/server/src/amocrm.ts

@@ -196,8 +196,10 @@ export class AmoClient {
    * Creates the lead in the configured pipeline. Omitting `status_id` makes
    * amoCRM drop it into that pipeline's first stage, which is what we want.
    */
-  async createLead(input: { name: string; contactId: number; fields: AmoFieldEntry[]; tags: string[] }): Promise<AmoLead> {
-    const embedded: Record<string, unknown> = { contacts: [{ id: input.contactId }] }
+  async createLead(input: { name: string; contactId?: number; fields: AmoFieldEntry[]; tags: string[] }): Promise<AmoLead> {
+    // `contactId` is optional because a call-button click has nobody to attach:
+    // the visitor never typed a name or a number. See LeadService.submitCallClick.
+    const embedded: Record<string, unknown> = input.contactId ? { contacts: [{ id: input.contactId }] } : {}
     const tags = [...new Set([...this.config.tags, ...input.tags])]
     if (tags.length) embedded.tags = tags.map((name) => ({ name }))
 
@@ -209,7 +211,7 @@ export class AmoClient {
           pipeline_id: this.config.pipelineId,
           responsible_user_id: this.config.responsibleUserId,
           custom_fields_values: input.fields.length ? input.fields : undefined,
-          _embedded: embedded,
+          _embedded: Object.keys(embedded).length ? embedded : undefined,
         },
       ],
     })