fix(docker): fix TDZ crash, icon bundle bloat, rate-limit on static assets

- Fix "Cannot access 'a' before initialization" TDZ error after login
  caused by manualChunks splitting react-vendor + lucide icons into
  circular ES-module chunks. Removed manualChunks entirely.

- Replace `import * as icons from "lucide-react"` (pulls all ~1000 icons)
  with a targeted icon-map of ~50 icons actually used by tool definitions.
  Reduces shared icons chunk from 745KB to 62KB (132KB→16KB gzip).

- Exclude static files from @fastify/rate-limit via allowList so rapid
  page navigations don't 429 on JS/CSS chunk requests.

- Move Docker auth defaults (AUTH_ENABLED, DEFAULT_USERNAME,
  DEFAULT_PASSWORD) from Dockerfile ENV to entrypoint.sh runtime exports
  to avoid SecretsUsedInArgOrEnv warnings.

- Fix Docker CMD to use pnpm --filter for workspace-scoped tsx binary.

- Set COREPACK_HOME system-wide so non-root user can access pnpm cache.

- Lazy-load all pages in App.tsx and all controls in
  pipeline-step-settings.tsx to keep main bundle under 300KB.

apps/web/src/pages/tool-page.tsx

@@ -1,6 +1,12 @@
 import { TOOLS } from "@ashim/shared";
-import * as icons from "lucide-react";
-import { CheckCircle2, ChevronLeft, ChevronRight, Download, Loader2 } from "lucide-react";
+import {
+  CheckCircle2,
+  ChevronLeft,
+  ChevronRight,
+  Download,
+  FileImage,
+  Loader2,
+} from "lucide-react";
 import { Suspense, useCallback, useEffect, useMemo, useRef, useState } from "react";
 import type { Crop } from "react-image-crop";
 import { useParams } from "react-router-dom";
@@ -17,6 +23,7 @@ import { EraserCanvas } from "@/components/tools/eraser-canvas";
 import type { PreviewTransform } from "@/components/tools/rotate-settings";
 import { useMobile } from "@/hooks/use-mobile";
 import { formatFileSize } from "@/lib/download";
+import { ICON_MAP } from "@/lib/icon-map";
 import { getToolRegistryEntry } from "@/lib/tool-registry";
 import { useFileStore } from "@/stores/file-store";
 
@@ -222,8 +229,7 @@ export function ToolPage() {
   }
 
   const IconComponent =
-    (icons as unknown as Record<string, React.ComponentType<{ className?: string }>>)[tool.icon] ||
-    icons.FileImage;
+    (ICON_MAP[tool.icon] as React.ComponentType<{ className?: string }>) ?? FileImage;
 
   const hasFile = files.length > 0;
   const hasProcessed = !!processedUrl;