feat: rebrand Hemmelig to paste.es for cloudhost.es

- Set Spanish as default language with ephemeral/encrypted privacy focus
- Translate all user-facing strings and legal pages to Spanish
- Replace Norwegian flag with Spanish flag in footer
- Remove Hemmelig/terces.cloud links, add cloudhost.es sponsorship
- Rewrite PrivacyPage: zero data collection, ephemeral design emphasis
- Rewrite TermsPage: Spanish law, RGPD, paste.es/CloudHost.es references
- Update PWA manifest, HTML meta tags, package.json branding
- Rename webhook headers to X-Paste-Event / X-Paste-Signature
- Update API docs title and contact to paste.es / cloudhost.es

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

prisma/migrations/20251204171251_add_api_keys/migration.sql

@@ -0,0 +1,15 @@
+-- CreateTable
+CREATE TABLE "api_keys" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "name" TEXT NOT NULL,
+    "key_hash" TEXT NOT NULL,
+    "key_prefix" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "last_used_at" DATETIME,
+    "expires_at" DATETIME,
+    "created_at" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "api_keys_userId_fkey" FOREIGN KEY ("userId") REFERENCES "user" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "api_keys_key_hash_key" ON "api_keys"("key_hash");