fix: safe status-recommendation flow, MO-016 order independence, brand constant, message codes

- Add a single shared, pure vehicle-status evaluator (app/services/vehicle_status.py)
  used identically by the data-quality scanner, a new non-mutating status-recommendation
  preview endpoint, and a transactional apply endpoint with optimistic-concurrency token
  revalidation -- eliminates the old opaque "calculate and apply" action and the unsafe
  "maintenance + active booking -> auto rented" shortcut. Frontend
  DataQualityIssueDetail.tsx now shows a review/decide/confirm panel with localized
  why/evidence/consequence text in nl-BE/en-GB/fr-BE, with an exact "Change status to
  <status>" confirm action per the brief.
- Fix MO-016 issue-order dependency: resolving the booking-overlap issue before vs.
  after the status-conflict issue now converges on the same final vehicle status,
  proven by test_mo_016_status_conflict_recommendation_is_order_independent.
- Make "Fleet Ops" a non-localizable brand constant (frontend/src/product.ts,
  backend PRODUCT_NAME) via {{productName}} interpolation everywhere the brand name
  appeared in locale prose; add a permanent test guarding against a translation file
  ever defining the brand name or an "appName" key again.
- Convert dynamic backend prose to stable message codes + params: return status
  reasons, audit field/actor-type labels, automation last_error, and search
  section/vehicle/booking/issue results all now carry codes the frontend localizes,
  with raw technical text demoted to a "Technical details" disclosure.
- docs/fleet-ops-correction/: gap audit, i18n inventory, and the vehicle-status
  decision table documenting the evaluator's rules and safe-status principles.

148 backend tests + Ruff + mypy green; Alembic migration verified upgrade/downgrade;
frontend tsc/build and the i18n-coverage Playwright suite green.

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

frontend/src/pages/AboutDemo.tsx

@@ -5,6 +5,7 @@ import { useDemoManifest } from "../context/DemoManifestContext";
 import { useLocaleFormat } from "../i18n/format";
 import { Icon } from "../components/Icons";
 import { IntegrationMark, LoadingState, PageHeader, SectionHeading } from "../components/PageChrome";
+import { PRODUCT_NAME } from "../product";
 
 const INTEGRATION_ICON: Record<string, "n8n" | "rag" | "mcp"> = {
   n8n: "n8n",
@@ -36,7 +37,7 @@ export function AboutDemo() {
     <div className="page">
       <PageHeader
         eyebrow={t("about.eyebrow")}
-        title={t("about.title")}
+        title={t("about.title", { productName: PRODUCT_NAME })}
         description={manifest ? t("about.description", { orgName: manifest.organization_name }) : undefined}
       />
 
@@ -58,12 +59,12 @@ export function AboutDemo() {
 
           <section className="record-surface about-card">
             <h2>{t("about.problemTitle")}</h2>
-            <p>{t("about.problemBody", { orgName: manifest.organization_name })}</p>
+            <p>{t("about.problemBody", { orgName: manifest.organization_name, productName: PRODUCT_NAME })}</p>
           </section>
 
           <section className="record-surface about-card">
             <h2>{t("about.scopeTitle")}</h2>
-            <p>{t("about.scopeBody")}</p>
+            <p>{t("about.scopeBody", { productName: PRODUCT_NAME })}</p>
           </section>
 
           <section className="record-surface about-card">