feat(seo): implement SEO audit remediations

- Add dynamic sitemap.ts, robots.ts, and llms.txt route
- Add metadataBase and JSON-LD Organization schema to layout
- Set canonical alternates for all routes
- Migrate raw img tags to next/image for LCP optimization
- Add SEO dictionary strings to tr.json and en.json

app/[lang]/galeri/GaleriClient.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useState } from "react";
+import Image from "next/image";
 import { motion, AnimatePresence } from "framer-motion";
 import { X, ZoomIn } from "lucide-react";
 import { Badge } from "@/app/components/ui/badge";
@@ -75,10 +76,11 @@ export default function GaleriClient({ lang, dict }: { lang: string; dict: any }
                 className="group relative aspect-square cursor-pointer overflow-hidden"
                 onClick={() => setLightbox(img)}
               >
-                <img
+                <Image
                   src={img.src}
                   alt={img.title}
-                  className="w-full h-full object-cover transition-transform duration-700 group-hover:scale-110"
+                  fill
+                  className="object-cover transition-transform duration-700 group-hover:scale-110"
                 />
                 <div className="absolute inset-0 bg-[var(--color-moy-dark)]/0 group-hover:bg-[var(--color-moy-dark)]/50 transition-all duration-300 flex flex-col items-center justify-center gap-3">
                   <ZoomIn
@@ -125,10 +127,12 @@ export default function GaleriClient({ lang, dict }: { lang: string; dict: any }
               className="max-w-4xl w-full"
               onClick={(e) => e.stopPropagation()}
             >
-              <img
+              <Image
                 src={lightbox.src}
                 alt={lightbox.title}
-                className="w-full max-h-[80vh] object-contain"
+                width={1200}
+                height={800}
+                className="w-full h-auto max-h-[80vh] object-contain"
               />
               <p className="text-center text-white font-serif text-xl mt-4">{lightbox.title}</p>
             </motion.div>