feat: tiered LLM (GLM free / Claude paid) + rate limits + quota enforcement

The free tier was hemorrhaging Anthropic cost with no abuse cap (no rate
limit on /preview, Opus default in the build worker, 5-min cache TTL that
made cache-miss the common case). This switches free users to GLM, paid
users to Claude tiers, and tightens every leak found in the audit.

Backend:
- @bmm/llm: GLM provider via Zhipu's OpenAI-compatible endpoint, pickPreviewModel
  + pickBuildModel helpers, plan-aware ModelChoice
- preview-cache TTL 5min -> 24h (kills the cache-miss path)
- /v1/servers/preview: picks model from caller's plan, returns model name to UI
- /v1/servers POST: enforces SERVER_LIMITS per plan (402), rate-limits builds
- daily rate-limit on preview (5/40/150/1000) and build (3/20/100/500)
- /v1/auth/me returns plan so the wizard can show the right model name
- generator worker: GLM default, Anthropic Sonnet fallback if GLM errors

Frontend:
- Wizard fetches plan, shows "<model> is drafting the tool spec" pre-emptively,
  upgrade hint for hobby users, friendly errors for 402 / 429
- Pricing page: AI-model line per tier (Open-tier / Haiku / Sonnet / Opus),
  Team €149 -> €199, Enterprise €499 -> €999, daily-preview limit per tier
- Privacy + Security: explicit subprocessor disclosure for Anthropic (US) /
  Zhipu (CN) and which tier uses which

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/app/(dashboard)/servers/new/page.tsx

@@ -7,6 +7,7 @@ import { StreamingLogs } from '@/components/streaming-logs';
 import { Button } from '@/components/ui/button';
 import { apiFetch } from '@/lib/api';
 import { Loader2, RotateCcw, X } from 'lucide-react';
+import Link from 'next/link';
 import { useRouter, useSearchParams } from 'next/navigation';
 import { Suspense, useEffect, useState } from 'react';
 
@@ -41,9 +42,15 @@ interface PreviewTool {
   inputSchema: Record<string, unknown>;
 }
 
+type Plan = 'hobby' | 'pro' | 'team' | 'enterprise';
+
 interface PreviewResponse {
   previewId: string;
-  source: 'claude' | 'mock';
+  source: 'claude' | 'glm' | 'mock';
+  plan?: Plan;
+  modelDisplayName?: string;
+  modelBadge?: 'open-tier' | 'claude-haiku' | 'claude-sonnet' | 'claude-opus';
+  upgradeHint?: boolean;
   spec: {
     name: string;
     description?: string;
@@ -53,6 +60,13 @@ interface PreviewResponse {
   };
 }
 
+const PREVIEW_MODEL_BY_PLAN: Record<Plan, { name: string; estimate: string }> = {
+  hobby: { name: 'Open-tier AI', estimate: '30–60 seconds' },
+  pro: { name: 'Claude Haiku 4.5', estimate: '10–20 seconds' },
+  team: { name: 'Claude Sonnet 4.6', estimate: '15–40 seconds' },
+  enterprise: { name: 'Claude Sonnet 4.6', estimate: '15–40 seconds' },
+};
+
 interface EditableTool {
   name: string;
   description: string;
@@ -86,6 +100,7 @@ function NewServerPageInner() {
   const router = useRouter();
   const [step, setStep] = useState<Step>('prompt');
   const [elapsedSec, setElapsedSec] = useState(0);
+  const [userPlan, setUserPlan] = useState<Plan | null>(null);
 
   const [prompt, setPrompt] = useState('');
   const [name, setName] = useState('');
@@ -207,6 +222,14 @@ function NewServerPageInner() {
     return () => clearInterval(id);
   }, [step]);
 
+  // Plan determines which model the preview will use — we display its name
+  // *before* the request so the user knows what they're waiting for.
+  useEffect(() => {
+    apiFetch<{ user: { plan?: Plan } }>('/v1/auth/me')
+      .then((r) => setUserPlan(r.user.plan ?? 'hobby'))
+      .catch(() => setUserPlan('hobby'));
+  }, []);
+
   async function analyze() {
     setError(null);
     if (prompt.trim().length < 10) {
@@ -358,13 +381,23 @@ function NewServerPageInner() {
       setServerId(res.server.id);
       setStep('building');
     } catch (e) {
-      const detail = (e as { detail?: { error?: string; detail?: unknown } }).detail;
+      const detail = (e as { detail?: { error?: string; detail?: string } }).detail;
       const code = detail?.error;
-      setError(
-        code === 'slug_taken'
-          ? `The slug "${slug}" is already used by one of your servers — change the Slug field above.`
-          : (code ?? (e as Error).message),
-      );
+      if (code === 'slug_taken') {
+        setError(
+          `The slug "${slug}" is already used by one of your servers — change the Slug field above.`,
+        );
+        return;
+      }
+      if (code === 'plan_limit_reached') {
+        setError(`${detail?.detail ?? 'Plan limit reached.'} See /pricing to upgrade.`);
+        return;
+      }
+      if (code === 'rate_limited') {
+        setError(detail?.detail ?? 'Daily build limit reached — try again tomorrow or upgrade.');
+        return;
+      }
+      setError(detail?.detail ?? code ?? (e as Error).message);
     }
   }
 
@@ -457,8 +490,18 @@ function NewServerPageInner() {
           <Loader2 className="mx-auto animate-spin text-[--color-accent]" size={22} />
           <p className="mt-4 text-[13px]">Analyzing your prompt…</p>
           <p className="mt-1 text-[12px] text-[--color-fg-subtle]">
-            Claude is drafting the tool spec. Usually 15–40 seconds.
+            {(userPlan ? PREVIEW_MODEL_BY_PLAN[userPlan] : PREVIEW_MODEL_BY_PLAN.hobby).name} is
+            drafting the tool spec. Usually{' '}
+            {(userPlan ? PREVIEW_MODEL_BY_PLAN[userPlan] : PREVIEW_MODEL_BY_PLAN.hobby).estimate}.
           </p>
+          {userPlan === 'hobby' && (
+            <p className="mt-2 text-[11px] text-[--color-fg-muted]">
+              <Link href="/pricing" className="text-[--color-accent] hover:underline">
+                Upgrade to Pro
+              </Link>{' '}
+              for ~3× faster analysis with Claude Haiku.
+            </p>
+          )}
           <p className="mono mt-3 text-[11px] tabular-nums text-[--color-fg-muted]">
             {elapsedSec}s elapsed
           </p>
@@ -524,7 +567,7 @@ function NewServerPageInner() {
                   </button>
                 )}
                 <span className="mono text-[10.5px] text-[--color-fg-subtle]">
-                  spec via {preview.source}
+                  drafted with {preview.modelDisplayName ?? preview.source}
                 </span>
               </div>
             </div>