feat: scaffold Astro project with en/fr i18n routing

Sets output to static (Astro default) with path-based i18n routing
(/en/, /fr/) and no unprefixed default-locale route, per the hub
landing page design spec.

package.json

@@ -0,0 +1,21 @@
+{
+  "name": "ombrora-landing",
+  "type": "module",
+  "version": "0.0.1",
+  "engines": {
+    "node": ">=22.12.0"
+  },
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "astro": "^7.1.6"
+  },
+  "devDependencies": {
+    "vitest": "^4.1.10"
+  }
+}