Add Gitea-to-Claude-Code-Routines webhook proxy

Express service that authenticates Gitea deliveries, verifies the HMAC
signature, builds a readable text summary for push/pull_request events,
and forwards it to the Anthropic routines API with the headers Gitea
can't set itself. Includes in-memory delivery dedup, structured logging,
.env.example, and a Dockerfile for deployment behind nginx.

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

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "gitea-claude-webhook-proxy",
+  "version": "1.0.0",
+  "description": "Proxy que recibe webhooks de Gitea y los reenvía a la API de Claude Code Routines",
+  "main": "server.js",
+  "type": "commonjs",
+  "engines": {
+    "node": ">=18"
+  },
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^4.19.2"
+  }
+}