refactor(projects): build the projects list on the octokit SDK

Replace hand-rolled REST paging, GraphQL cursor loops and header plumbing with
octokit, which also brings request retry and rate-limit backoff. Introduces the
repo's first package.json, lockfile and ESLint flat config; the Hugo site build
itself still needs no Node step.

Output verified against the previous implementation: identical counts and rows
apart from live star drift on four upstream repos.

package.json

@@ -0,0 +1,21 @@
+{
+  "name": "blog",
+  "version": "0.0.0",
+  "private": true,
+  "description": "Tooling for miti99.com — the Hugo site itself needs no Node build step.",
+  "type": "module",
+  "engines": {
+    "node": ">=24"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "projects:refresh": "node .github/scripts/update-projects-list.mjs"
+  },
+  "dependencies": {
+    "octokit": "^5.0.5"
+  },
+  "devDependencies": {
+    "@eslint/js": "^10.0.1",
+    "eslint": "^10.10.0"
+  }
+}