remove legacy backend stack and stale deployment docs after rebuild

frontend/Dockerfile

@@ -2,25 +2,22 @@ FROM node:20-alpine AS base
 
 WORKDIR /app
 
-# Install dependencies
 FROM base AS deps
 COPY package.json ./
 RUN npm install
 
-# Build
 FROM base AS builder
-ARG NEXT_PUBLIC_API_URL=http://backend:3001
+ARG NEXT_PUBLIC_API_URL=
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 RUN mkdir -p public && npm run build
 
-# Production
 FROM base AS runner
 WORKDIR /app
 
 ENV NODE_ENV=production
-ARG NEXT_PUBLIC_API_URL=http://backend:3001
+ARG NEXT_PUBLIC_API_URL=
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 
 RUN addgroup --system --gid 1001 nodejs

frontend/app/auth/signup/page.tsx

@@ -19,7 +19,7 @@ export default function SignUpPage() {
       )}
     >
       <p className="text-sm text-[color:var(--terminal-muted)]">
-        For production deployment you can reintroduce Better Auth, but the rebuilt stack is intentionally self-contained for fast iteration.
+        For production deployment you can reintroduce full multi-user authentication, but this rebuild is intentionally self-contained for fast iteration.
       </p>
 
       <Link href="/" className="mt-6 block">

frontend/app/filings/page.tsx

@@ -126,7 +126,7 @@ function FilingsPageContent() {
       )}
     >
       {liveTask ? (
-        <Panel title="Active Task" subtitle={`${liveTask.task_type} is processing in worker.`}>
+        <Panel title="Active Task" subtitle={`${liveTask.task_type} is processing in the task engine.`}>
           <div className="flex items-center justify-between gap-3 rounded-lg border border-[color:var(--line-weak)] bg-[color:var(--panel-soft)] px-3 py-2">
             <p className="text-sm text-[color:var(--terminal-bright)]">{liveTask.id}</p>
             <StatusPill status={liveTask.status} />

frontend/app/layout.tsx

@@ -3,7 +3,7 @@ import type { Metadata } from 'next';
 
 export const metadata: Metadata = {
   title: 'Fiscal Clone',
-  description: 'Futuristic fiscal intelligence terminal powered by Better Auth and durable AI tasks.'
+  description: 'Futuristic fiscal intelligence terminal with durable tasks and OpenClaw integration.'
 };
 
 export default function RootLayout({ children }: { children: React.ReactNode }) {