chore: add coolify-ready docker packaging and deployment env template

.dockerignore

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+.git
+node_modules
+npm-debug.log
+data
+coverage
+.env

.env.example

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+# Runtime
+NODE_ENV=production
+PORT=3000
+STATE_FILE_PATH=/data/state.json
+
+# Webhook secrets
+X_WEBHOOK_SECRET=replace-me
+POLAR_WEBHOOK_SECRET=replace-me
+
+# Credit policy
+BASE_CREDITS=1
+INCLUDED_CHARS=25000
+STEP_CHARS=10000
+STEP_CREDITS=1
+MAX_CHARS_PER_ARTICLE=120000
+
+# Rate limits (requests per minute)
+WEBHOOK_RPM=120
+AUTH_RPM=30
+ACTION_RPM=60

Dockerfile

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+FROM node:22-alpine
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV STATE_FILE_PATH=/data/state.json
+
+COPY package.json ./
+COPY src ./src
+COPY README.md ./README.md
+COPY spec.md ./spec.md
+
+EXPOSE 3000
+VOLUME ["/data"]
+
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 CMD node -e "fetch('http://127.0.0.1:'+process.env.PORT+'/health').then((r)=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"
+
+CMD ["node", "src/server.js"]

test/deployment.test.js

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+"use strict";
+
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const fs = require("node:fs");
+
+test("Dockerfile contains production container essentials", () => {
+  const dockerfile = fs.readFileSync("Dockerfile", "utf8");
+  assert.match(dockerfile, /FROM node:22-alpine/);
+  assert.match(dockerfile, /EXPOSE 3000/);
+  assert.match(dockerfile, /STATE_FILE_PATH=\/data\/state\.json/);
+  assert.match(dockerfile, /HEALTHCHECK/);
+  assert.match(dockerfile, /CMD \["node", "src\/server\.js"\]/);
+});
+
+test("env example includes required webhook and credit settings", () => {
+  const envFile = fs.readFileSync(".env.example", "utf8");
+  assert.match(envFile, /X_WEBHOOK_SECRET=/);
+  assert.match(envFile, /POLAR_WEBHOOK_SECRET=/);
+  assert.match(envFile, /INCLUDED_CHARS=/);
+  assert.match(envFile, /WEBHOOK_RPM=/);
+});