chore: remove files importing pruned packages (ai, cms, cognitive-context)

Step 3 pruned packages/{ai,cms,cognitive-context} but left whole
route groups + feature modules that depended on them. Those files
were unbuildable since that prune. Removes them now so the workspace
can be validated:

Route groups:
- apps/web/src/app/[locale]/(apps)/{chat,image,pdf,tts}/
- apps/web/src/app/[locale]/(marketing)/blog/

Feature modules:
- apps/web/src/modules/{chat,image,pdf,tts,common/ai,marketing/blog}/
- packages/api/src/modules/ai/  (chat, image, pdf, stt, tts, router)

3 stragglers remain (separate handoff to claudemesh-2):
- apps/web/src/app/[locale]/(marketing)/legal/[slug]/page.tsx  (cms)
- apps/web/src/app/sitemap.ts                                   (cms)
- apps/web/src/modules/common/layout/credits/index.tsx          (ai)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/modules/marketing/blog/tags-picker.tsx

@@ -1,36 +0,0 @@
-"use client";
-
-import { parseAsStringLiteral, useQueryState } from "nuqs";
-
-import { ContentTag } from "@turbostarter/cms";
-import { useTranslation } from "@turbostarter/i18n";
-import { cn } from "@turbostarter/ui";
-import { Button } from "@turbostarter/ui-web/button";
-
-export const TagsPicker = () => {
-  const { t } = useTranslation("marketing");
-  const [activeTag, setActiveTag] = useQueryState("tag", {
-    ...parseAsStringLiteral(Object.values(ContentTag)),
-    shallow: false,
-  });
-
-  return (
-    <div className="mx-auto flex flex-wrap items-center justify-center gap-1.5">
-      {Object.values(ContentTag).map((tag) => (
-        <Button
-          key={tag}
-          variant={tag === activeTag ? "default" : "outline"}
-          size="sm"
-          className={cn("rounded-full px-4", {
-            "border-primary border": tag === activeTag,
-          })}
-          onClick={() =>
-            activeTag === tag ? setActiveTag(null) : setActiveTag(tag)
-          }
-        >
-          {t(`blog.tag.${tag}`)}
-        </Button>
-      ))}
-    </div>
-  );
-};