Add cfddns app - Cloudflare DDNS using favonia image

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/cfddns/config.json

@@ -0,0 +1,65 @@
+{
+  "$schema": "../app-info-schema.json",
+  "name": "Cloudflare DDNS",
+  "id": "cfddns",
+  "available": true,
+  "exposable": false,
+  "dynamic_config": true,
+  "no_gui": true,
+  "tipi_version": 7,
+  "version": "1.17.0",
+  "categories": [
+    "network",
+    "utilities"
+  ],
+  "description": "Automatically update Cloudflare DNS records with your current public IP. Supports multiple domains, IPv4/IPv6, and proxy toggle.",
+  "short_desc": "Dynamic DNS updater for Cloudflare",
+  "author": "favonia",
+  "source": "https://github.com/favonia/cloudflare-ddns",
+  "form_fields": [
+    {
+      "type": "password",
+      "label": "Cloudflare API Token",
+      "env_variable": "CLOUDFLARE_API_TOKEN",
+      "required": true,
+      "hint": "API token with DNS edit permissions"
+    },
+    {
+      "type": "text",
+      "label": "Domains (comma-separated)",
+      "env_variable": "DOMAINS",
+      "required": true,
+      "hint": "e.g. home.example.com,vpn.example.com"
+    },
+    {
+      "type": "boolean",
+      "label": "Proxied (Orange Cloud)",
+      "env_variable": "PROXIED",
+      "required": false,
+      "default": false
+    },
+    {
+      "type": "text",
+      "label": "Update Schedule",
+      "env_variable": "UPDATE_CRON",
+      "required": false,
+      "default": "@every 5m",
+      "hint": "Cron expression or @every Xm"
+    },
+    {
+      "type": "text",
+      "label": "Timezone",
+      "env_variable": "TZ",
+      "required": false,
+      "default": "UTC"
+    }
+  ],
+  "supported_architectures": [
+    "arm64",
+    "amd64"
+  ],
+  "created_at": 1736974800000,
+  "updated_at": 1736974800000,
+  "deprecated": false,
+  "min_tipi_version": "4.5.0"
+}