design: AI 템플릿 패턴 전면 제거 Round 2 + 컨텐츠 정합성 수정

- 홈: hero gradient text → solid #5ba4ff, 토스페이먼츠 tech 제거, 사주 가격 '무료'로 수정
- 사주: CTA 버튼 gradient 제거, radial dots+이모지 CTA 섹션 → diagonal pattern
  유료 카드 gradient+orb 제거, FAQ 유료 언급 수정, 가격 섹션 제목 수정
- freelance: useCounter/StatCard 제거 → 4개 보증 카드로 대체, 모든 gradient 제거
- login: blur orbs 제거, gradient logo/버튼 → solid
- mypage: gradient 헤더/아바타 → solid + diagonal pattern
- DashboardShell: gradient '쟁' 로고 → solid
- automation: gradient step/pricing/CTA → solid
- ai-kit: gradient 배경들 → solid, gradient text → solid red-400

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/components/DashboardShell.tsx

@@ -33,7 +33,7 @@ export default function DashboardShell({ children }: { children: React.ReactNode
             </svg>
           </button>
           <div className="flex items-center gap-2">
-            <div className="w-7 h-7 rounded-lg bg-gradient-to-br from-blue-500 to-violet-600 flex items-center justify-center text-white font-bold text-xs">
+            <div className="w-7 h-7 rounded-lg bg-[#1a56db] flex items-center justify-center text-white font-bold text-xs">
               쟁
             </div>
             <span className="text-white font-bold text-base">쟁승메이드</span>