Build TercihAI MVP: landing page, YÖK Atlas data pipeline, rank-based results

- Add product vision/market research doc (VISION.md)
- Set up shadcn/ui (radix + nova preset) with blue/orange theme, Outfit + Work Sans fonts
- Landing page: hero with rank input, problem/steps sections, comparison table, FAQ
- Data pipeline: CSV archive ingest (2021-2024) + live YÖK Atlas API refresh (2025)
  into SQLite (npm run ingest / refresh); zeros normalized to NULL
- /sonuc page: hayal/dengeli/garanti buckets by COALESCE(sira2025, sira2024),
  score-type switcher, 2024→2025 trend indicators
- Add ui-ux-pro-max and shadcn agent skills, shadcn MCP config, launch.json

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/lib/utils.ts

@@ -0,0 +1,6 @@
+import { clsx, type ClassValue } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}