Merged Caddy into docker-compose and added edge CORS handling

Caddyfile

@@ -0,0 +1,20 @@
+ai-gateway.ldex.dev {
+    # 1. Force CORS headers for every request
+    header {
+        Access-Control-Allow-Origin *
+        Access-Control-Allow-Methods "GET, POST, OPTIONS"
+        Access-Control-Allow-Headers "*"
+        Access-Control-Expose-Headers "*"
+    }
+
+    # 2. Immediately handle OPTIONS requests (the preflight)
+    @options {
+        method OPTIONS
+    }
+    handle @options {
+        respond "" 204
+    }
+
+    # 3. Proxy everything else to the app
+    reverse_proxy ai-gateway:8000
+}