feat: SEO altyapısı + admin editör/favicon/menü düzeltmeleri

Admin & site:
- @tailwindcss/typography ekle → editör ve yayın içeriği prose stilleriyle düzgün render
- Favicon: logo.png'den kare app/icon.png + apple-icon.png, varsayılan favicon.ico kaldırıldı
- SEO keyword: seo_settings.default_keywords + seo_pages.keywords + buildMetadata birleştirme
- Menü düzeni admin'den yönetilebilir (site_settings.nav_items, /admin/menu, header & mobile-menu refactor)

SEO:
- app/sitemap.ts (statik + blog/hizmet/çözüm/proje/sektör dinamik)
- app/robots.ts (sitemap ref + /admin,/api disallow)
- app/llms.txt/route.ts (AI/LLM rehberi)
- BlogPosting/Service/FAQ/Article JSON-LD wire (json-ld bileşenleri bağlandı)
- buildMetadata: blog/proje OG görseli + type article + keywords birleştirme düzeltmesi
- blog tags → keyword

package-lock.json

@@ -8,6 +8,7 @@
       "name": "kovak-yazilim",
       "version": "0.1.0",
       "dependencies": {
+        "@tailwindcss/typography": "^0.5.19",
         "@tiptap/extension-image": "^3.23.5",
         "@tiptap/extension-link": "^3.23.5",
         "@tiptap/extension-placeholder": "^3.23.5",
@@ -1083,6 +1084,18 @@
         "tailwindcss": "4.3.0"
       }
     },
+    "node_modules/@tailwindcss/typography": {
+      "version": "0.5.19",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/typography/-/typography-0.5.19.tgz",
+      "integrity": "sha512-w31dd8HOx3k9vPtcQh5QHP9GwKcgbMp87j58qi6xgiBnFFtKEAgCWnDw4qUT8aHwkCp8bKvb/KGKWWHedP0AAg==",
+      "license": "MIT",
+      "dependencies": {
+        "postcss-selector-parser": "6.0.10"
+      },
+      "peerDependencies": {
+        "tailwindcss": ">=3.0.0 || insiders || >=4.0.0-alpha.20 || >=4.0.0-beta.1"
+      }
+    },
     "node_modules/@tiptap/core": {
       "version": "3.23.5",
       "resolved": "https://registry.npmjs.org/@tiptap/core/-/core-3.23.5.tgz",
@@ -1622,6 +1635,18 @@
       "integrity": "sha512-IV3Ou0jSMzZrd3pZ48nLkT9DA7Ag1pnPzaiQhpW7c3RbcqqzvzzVu+L8gfqMp/8IM2MQtSiqaCxrrcfu8I8rMA==",
       "license": "MIT"
     },
+    "node_modules/cssesc": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cssesc/-/cssesc-3.0.0.tgz",
+      "integrity": "sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg==",
+      "license": "MIT",
+      "bin": {
+        "cssesc": "bin/cssesc"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/csstype": {
       "version": "3.2.3",
       "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.2.3.tgz",
@@ -2128,6 +2153,19 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/postcss-selector-parser": {
+      "version": "6.0.10",
+      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.10.tgz",
+      "integrity": "sha512-IQ7TZdoaqbT+LCpShg46jnZVlhWD2w6iQYAcYXfHARZ7X1t/UGhhceQDs5X0cGqKvYlHNOuv7Oa1xmb0oQuA3w==",
+      "license": "MIT",
+      "dependencies": {
+        "cssesc": "^3.0.0",
+        "util-deprecate": "^1.0.2"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/prosemirror-changeset": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/prosemirror-changeset/-/prosemirror-changeset-2.4.1.tgz",
@@ -2384,7 +2422,6 @@
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.3.0.tgz",
       "integrity": "sha512-y6nxMGB1nMW9R6k96e5gdIFzcfL/gTJRNaqGes1YvkLnPVXzWgbqFF2yLC0T8G774n24cx3Pe8XrKoniCOAH+Q==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/tapable": {
@@ -2437,6 +2474,12 @@
         "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
     "node_modules/w3c-keyname": {
       "version": "2.2.8",
       "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",