feat: add Twilio action with sendMessage function

Introduce a new twilio-action that integrates with the Twilio Messages API
for Hercules automations. Version 1 provides the core capability of sending
messages (SMS, MMS, and channel messages such as WhatsApp).

- sendMessage runtime function (To, Body, optional From and MediaUrl)
- TWILIO_MESSAGE response data type modeling the Twilio message resource
- Action configs: account_sid, auth_token, from_number, base_url
- Follows the existing action conventions (hercules decorators + axios REST
  client, zod-backed schemas), mirroring the gls-action layout
- Register twilio-action in the .gitlab-ci.yml node-actions matrix

Refs #33

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Hrvb3LRhmxcrASCuSXc7Jn

Author: claude

.gitlab-ci.yml

@@ -24,6 +24,7 @@ include:
   - shopify-action
   - woocommerce-action
   - shopware-action
+  - twilio-action
 
 test-node:
   image: node:24.10.0

actions/twilio-action/.gitignore

@@ -0,0 +1,3 @@
+.env
+node_modules/
+dist/

actions/twilio-action/Dockerfile

@@ -0,0 +1,13 @@
+FROM node:24.10.0-alpine
+
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+
+RUN npm install
+
+COPY . .
+
+RUN npm run build
+
+CMD ["npm", "run", "start"]