chore: settle product naming across app, widget and deployments

One word everywhere: ReplyPier in UI copy, package and image names, the
replypier.site domains (app/api/docs/help), REPLYPIER_* settings and the
--rp-* design tokens.

- public widget API is window.ReplyPier with replypierId / replypierBaseUrl /
  replypierConfig / replypierToken, loader at webclient/replypier.min.js;
  both bundles rebuilt from source
- NOTICE, llms.txt, CONTRIBUTING, HELP_CENTER_INFRA and the demo runtime
  config rewritten; the demo config ships no third-party keys
- migration adds the ReplyPier managed model value to the AI model enum
- local compose project, database, role, volume and Docker network carry the
  same name

e2e/specs/crm/pipedrive.org.spec.ts

@@ -49,9 +49,9 @@ test.describe('Pipedrive', () => {
 
     const personId = (created.response as { data: { id: number } }).data.id
     const [lead] = (await externals.calls('pipedrive', 'leads', { contains: `"person_id":${personId}` })).filter((c) => c.method === 'POST')
-    expect(lead.body).toMatchObject({ title: `${name} — ChatterMate lead`, person_id: personId })
+    expect(lead.body).toMatchObject({ title: `${name} — ReplyPier lead`, person_id: personId })
     const leadId = (lead.response as { data: { id: string } }).data.id
     const [note] = await externals.calls('pipedrive', 'notes', { contains: leadId })
-    expect(note.body).toMatchObject({ lead_id: leadId, content: expect.stringContaining('Lead captured by ChatterMate') })
+    expect(note.body).toMatchObject({ lead_id: leadId, content: expect.stringContaining('Lead captured by ReplyPier') })
   })
 })