chore(worker): add Dockerfile and Dokploy README (build path: worker/)

worker/Dockerfile

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+FROM node:20
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Install dependencies first (copy package files)
+COPY package.json package-lock.json ./
+
+# Install full dependencies so `tsx` can run worker/index.ts
+RUN npm ci --silent
+
+# Copy only required directories to keep image smaller
+COPY worker ./worker
+COPY lib ./lib
+COPY node_modules ./node_modules
+COPY .env* ./
+COPY tsconfig.json ./
+
+ENV NODE_ENV=production
+
+# Set working directory to repo root; worker is invoked by npm script
+WORKDIR /usr/src/app
+
+CMD ["npm", "run", "worker:start"]

worker/README.md

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+Worker container and Dokploy settings
+====================================
+
+Build context
+-------------
+- Build path: `worker/` (Dokploy should use this path so the worker Dockerfile is found)
+- Dockerfile: `worker/Dockerfile`
+
+Recommended Dokploy settings
+----------------------------
+- Provider: `Gitea`
+- Repository: `ahmido/tenantpilot` (or your repo)
+- Branch: `development`
+- Build path: `worker/`
+- Watch paths: `worker/**`, `lib/**`, `package.json`, `package-lock.json`
+
+Notes
+-----
+- The `Dockerfile` runs `npm ci` and then `npm run worker:start`, which uses `tsx` to execute `worker/index.ts` directly.
+- If you prefer a smaller production image, consider adding a build step to compile TypeScript to JS and run the compiled output with `node`.
+- If Dokploy requires a separate webhook per app, use the worker webhook URL provided in this repo's docs/workflow.