seo: add sitemap, robots.txt and optimised page titles/descriptions

- @astrojs/sitemap generates sitemap-index.xml at build time
- robots.txt points crawlers to the sitemap
- generators.ts extended with seoTitle and seoDescription per generator
- All generator pages now use seoTitle/seoDescription for <title> and <meta description>

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

package-lock.json

@@ -8,6 +8,7 @@
       "name": "randify",
       "version": "0.0.1",
       "dependencies": {
+        "@astrojs/sitemap": "^3.2.1",
         "@tailwindcss/vite": "^4.0.0",
         "astro": "^4.16.0",
         "tailwindcss": "^4.0.0"
@@ -59,6 +60,17 @@
         "node": "^18.17.1 || ^20.3.0 || >=21.0.0"
       }
     },
+    "node_modules/@astrojs/sitemap": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/@astrojs/sitemap/-/sitemap-3.2.1.tgz",
+      "integrity": "sha512-uxMfO8f7pALq0ADL6Lk68UV6dNYjJ2xGUzyjjVj60JLBs5a6smtlkBYv3tQ0DzoqwS7c9n4FUx5lgv0yPo/fgA==",
+      "license": "MIT",
+      "dependencies": {
+        "sitemap": "^8.0.0",
+        "stream-replace-string": "^2.0.0",
+        "zod": "^3.23.8"
+      }
+    },
     "node_modules/@astrojs/telemetry": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/@astrojs/telemetry/-/telemetry-3.1.0.tgz",
@@ -1795,6 +1807,24 @@
         "@types/unist": "*"
       }
     },
+    "node_modules/@types/node": {
+      "version": "24.12.3",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.12.3.tgz",
+      "integrity": "sha512-8oljBDGun9cIsZRJR6fkihn0TSXJI0UDOOhncYaERq6M0JMDoPLxyscwruJcb4GKS6dvK/d8xebYBg27h/duaQ==",
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~7.16.0"
+      }
+    },
+    "node_modules/@types/sax": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/@types/sax/-/sax-1.2.7.tgz",
+      "integrity": "sha512-rO73L89PJxeYM3s3pPPjiPgVVcymqU490g0YO5n5By0k2Erzj6tay/4lr1CHAAU4JyOWd1rpQ8bCf6cZfHU96A==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/unist": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/@types/unist/-/unist-3.0.3.tgz",
@@ -1883,6 +1913,12 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
+    "node_modules/arg": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/arg/-/arg-5.0.2.tgz",
+      "integrity": "sha512-PYjyFOLKQ9y57JvQ6QLo8dAgNqswh8M1RMJYdQduT6xbWSgK36P/Z/v+p888pM69jMMfS8Xd8F6I1kQ/I9HUGg==",
+      "license": "MIT"
+    },
     "node_modules/argparse": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
@@ -5315,6 +5351,15 @@
         "queue-microtask": "^1.2.2"
       }
     },
+    "node_modules/sax": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/sax/-/sax-1.6.0.tgz",
+      "integrity": "sha512-6R3J5M4AcbtLUdZmRv2SygeVaM7IhrLXu9BmnOGmmACak8fiUtOsYNWUS4uK7upbmHIBbLBeFeI//477BKLBzA==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=11.0.0"
+      }
+    },
     "node_modules/section-matter": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/section-matter/-/section-matter-1.0.0.tgz",
@@ -5417,6 +5462,31 @@
       "resolved": "https://registry.npmjs.org/sisteransi/-/sisteransi-1.0.5.tgz",
       "integrity": "sha512-bLGGlR1QxBcynn2d5YmDX4MGjlZvy2MRBDRNHLJ8VI6l6+9FUiyTFNJ0IveOSP0bcXgVDPRcfGqA0pjaqUpfVg=="
     },
+    "node_modules/sitemap": {
+      "version": "8.0.3",
+      "resolved": "https://registry.npmjs.org/sitemap/-/sitemap-8.0.3.tgz",
+      "integrity": "sha512-9Ew1tR2WYw8RGE2XLy7GjkusvYXy8Rg6y8TYuBuQMfIEdGcWoJpY2Wr5DzsEiL/TKCw56+YKTCCUHglorEYK+A==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "^17.0.5",
+        "@types/sax": "^1.2.1",
+        "arg": "^5.0.0",
+        "sax": "^1.4.1"
+      },
+      "bin": {
+        "sitemap": "dist/cli.js"
+      },
+      "engines": {
+        "node": ">=14.0.0",
+        "npm": ">=6.0.0"
+      }
+    },
+    "node_modules/sitemap/node_modules/@types/node": {
+      "version": "17.0.45",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-17.0.45.tgz",
+      "integrity": "sha512-w+tIMs3rq2afQdsPJlODhoUEKzFP1ayaoyl1CcnwtIlsVe7K7bA1NGm4s3PraqTLlXnbIN84zuBlxBWo1u9BLw==",
+      "license": "MIT"
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -5450,6 +5520,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/stream-replace-string": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/stream-replace-string/-/stream-replace-string-2.0.0.tgz",
+      "integrity": "sha512-TlnjJ1C0QrmxRNrON00JvaFFlNh5TTG00APw23j74ET7gkQpTASi6/L2fuiav8pzK715HXtUeClpBTw2NPSn6w==",
+      "license": "MIT"
+    },
     "node_modules/string-width": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
@@ -5625,6 +5701,12 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/undici-types": {
+      "version": "7.16.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.16.0.tgz",
+      "integrity": "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw==",
+      "license": "MIT"
+    },
     "node_modules/unified": {
       "version": "11.0.5",
       "resolved": "https://registry.npmjs.org/unified/-/unified-11.0.5.tgz",