chore(brand): rename the product to ReplyPier

The upstream project name is gone from code, assets, docs and build
output: brand strings, domains (replypier.site and its app/api/docs/help
subdomains), env prefixes, image and network names, the widget's public
JS API (window.ReplyPier, replypierId/BaseUrl/Config/Token), CSS tokens
(--rp-*), file and directory names, and the WordPress plugin package.

- widget loader is now webclient/replypier.min.js; both bundles rebuilt
  from source (backend/assets/widget.{js,css}, frontend/public/webclient)
- NOTICE, llms.txt, CONTRIBUTING, HELP_CENTER_INFRA and config.dev.js
  rewritten rather than string-swapped; the demo config no longer ships
  the previous vendor's Firebase/Razorpay/Google keys
- new migration replypier_ai_model_001 adds REPLYPIER to the managed
  AIModelType and rewrites pre-rename rows
- local compose project, database, role and volume renamed; LOCAL_DEPLOY
  documents carrying the old local data over

e2e/specs/a11y/a11y.spec.ts

@@ -11,14 +11,14 @@ test.describe('accessibility', () => {
     await expectNoNewA11yViolations(anonymousPage, 'login')
   })
 
-  // The dashboard is dark unless the user picks light (stored as cm-theme); both are checked.
+  // The dashboard is dark unless the user picks light (stored as rp-theme); both are checked.
   for (const scheme of ['dark', 'light'] as const) {
     const suffix = scheme === 'dark' ? '' : '-light'
 
     test(`dashboard screens, ${scheme} theme @a11y`, async ({ page, agent, agentsPage, aiConfigPage, ticketsPage, peoplePage }) => {
       // An agent of its own, so the agents screen is the list (with a card to check), not first-run setup.
       expect(agent.id).toBeTruthy()
-      await page.addInitScript((theme) => localStorage.setItem('cm-theme', theme), scheme)
+      await page.addInitScript((theme) => localStorage.setItem('rp-theme', theme), scheme)
       await new InboxPage(page).goto()
       expect(await page.evaluate(() => document.documentElement.dataset.theme)).toBe(scheme)
       await expectNoNewA11yViolations(page, `inbox${suffix}`)