Add fotos.carloselugo.com photo-upload service

Event photo upload app with OAuth2 (Google Drive), Caddy route, and
env-var-driven compose config. Refresh token persists to token.json
so re-auth isn't needed after container restarts.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

photo-upload/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "evento-fotos-upload",
+  "version": "1.0.0",
+  "description": "Landing page de cero fricción para subir fotos de un evento directo a Google Drive, sin login ni registro.",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "node --watch server.js"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  },
+  "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.5",
+    "express": "^4.19.2",
+    "googleapis": "^140.0.1",
+    "multer": "^1.4.5-lts.1"
+  }
+}