feat(landing): rename crew to "El valle" + source downloads from launcher.json

Rename all "crew" mentions (en/es/eu) to the untranslated proper name
"El valle" across hero, members, and features copy in i18n/ui.ts.

Rewire the homepage launcher download list to the custom-launcher build
output launcher.json (productName/version/files[]) instead of the
never-produced launcher-manifest.json shape. site.ts now reads launcher.json
and normalizes files[] -> internal builds[]; launcher.example.json is the
committed fallback. Drop the stale launcher-manifest.example/schema, update
.gitignore and docs (CLAUDE.md, plan/18).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

landing/src/i18n/ui.ts

@@ -188,7 +188,7 @@ export const ui: Record<Lang, UI> = {
       eyebrow: "Modded LAN · NeoForge",
       tagline: "Kitchen-sink survival, built to outlast the weekend.",
       sub:
-        "A self-hosted modded server for the crew — a curated tech + magic + " +
+        "A self-hosted modded server for El valle — a curated tech + magic + " +
         "exploration pack, your own skins, one-click setup. Grab the address, " +
         "import the pack, dig in.",
       copyIp: "Copy IP",
@@ -206,14 +206,14 @@ export const ui: Record<Lang, UI> = {
     },
     statLabels: ["Mods", "NeoForge", "Player slots", "World backups"],
     members: {
-      eyebrow: "The crew",
+      eyebrow: "El valle",
       title: "Who's on the server.",
       lead: "Everyone registered on Ulicraft, with their own self-hosted skin.",
       empty: "No members yet — be the first to register.",
     },
     features: {
       eyebrow: "What makes it Ulicraft",
-      title: "Built for the crew.",
+      title: "Built for El valle.",
       lead:
         "Self-hosted, curated, and persistent — a modded server that respects " +
         "your time and outlives the LAN.",
@@ -370,7 +370,7 @@ export const ui: Record<Lang, UI> = {
       eyebrow: "LAN con mods · NeoForge",
       tagline: "Supervivencia todo incluido, para durar más que el finde.",
       sub:
-        "Un servidor con mods autoalojado para la cuadrilla: un pack curado de " +
+        "Un servidor con mods autoalojado para El valle: un pack curado de " +
         "tecnología, magia y exploración, tus propias skins y configuración en un " +
         "clic. Copia la dirección, importa el pack y a cavar.",
       copyIp: "Copiar IP",
@@ -388,14 +388,14 @@ export const ui: Record<Lang, UI> = {
     },
     statLabels: ["Mods", "NeoForge", "Plazas", "Copias del mundo"],
     members: {
-      eyebrow: "La cuadrilla",
+      eyebrow: "El valle",
       title: "Quién está en el servidor.",
       lead: "Todos los registrados en Ulicraft, cada uno con su skin autoalojada.",
       empty: "Aún no hay miembros — sé el primero en registrarte.",
     },
     features: {
       eyebrow: "Qué hace especial a Ulicraft",
-      title: "Hecho para la cuadrilla.",
+      title: "Hecho para El valle.",
       lead:
         "Autoalojado, curado y persistente: un servidor con mods que respeta tu " +
         "tiempo y sobrevive a la LAN.",
@@ -552,7 +552,7 @@ export const ui: Record<Lang, UI> = {
       eyebrow: "Mod-dun LANa · NeoForge",
       tagline: "Mod ugariko biziraupena, irauteko egina.",
       sub:
-        "Koadrilarentzako mod-dun zerbitzari auto-ostatatua: teknologia, magia eta " +
+        "El valle-rentzako mod-dun zerbitzari auto-ostatatua: teknologia, magia eta " +
         "esplorazio pack zaindua, zure azalak eta konfigurazioa klik bakarrean. " +
         "Hartu helbidea, inportatu packa eta hasi zulatzen.",
       copyIp: "Kopiatu IPa",
@@ -570,14 +570,14 @@ export const ui: Record<Lang, UI> = {
     },
     statLabels: ["Modak", "NeoForge", "Plazak", "Munduaren babeskopiak"],
     members: {
-      eyebrow: "Koadrila",
+      eyebrow: "El valle",
       title: "Nor dago zerbitzarian.",
       lead: "Ulicraft-en erregistratutako guztiak, bakoitza bere azal auto-ostatatuarekin.",
       empty: "Oraindik ez dago kiderik — izan zaitez lehena erregistratzen.",
     },
     features: {
       eyebrow: "Zerk egiten du Ulicraft berezi",
-      title: "Koadrilarentzat eginda.",
+      title: "El valle-rentzat eginda.",
       lead:
         "Auto-ostatatua, zaindua eta iraunkorra: zure denbora errespetatzen duen " +
         "eta LANa gainditzen duen mod-dun zerbitzaria.",