Initial MVP: DocFast PDF API

- HTML/Markdown to PDF conversion via Puppeteer
- Invoice and receipt templates
- API key auth + rate limiting
- Dockerfile for deployment

README.md

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+# DocFast API
+
+Fast, simple HTML/Markdown to PDF API with built-in invoice templates.
+
+## Quick Start
+
+```bash
+npm install
+npm run build
+API_KEYS=your-key-here npm start
+```
+
+## Endpoints
+
+### Convert HTML to PDF
+```bash
+curl -X POST http://localhost:3100/v1/convert/html \
+  -H "Authorization: Bearer YOUR_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{"html": "<h1>Hello</h1><p>World</p>"}' \
+  -o output.pdf
+```
+
+### Convert Markdown to PDF
+```bash
+curl -X POST http://localhost:3100/v1/convert/markdown \
+  -H "Authorization: Bearer YOUR_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{"markdown": "# Hello\n\nWorld"}' \
+  -o output.pdf
+```
+
+### Invoice Template
+```bash
+curl -X POST http://localhost:3100/v1/templates/invoice/render \
+  -H "Authorization: Bearer YOUR_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "invoiceNumber": "INV-001",
+    "date": "2026-02-14",
+    "from": {"name": "Your Company", "email": "you@example.com"},
+    "to": {"name": "Client", "email": "client@example.com"},
+    "items": [{"description": "Service", "quantity": 1, "unitPrice": 100, "taxRate": 20}]
+  }' \
+  -o invoice.pdf
+```
+
+### Options
+- `format`: Paper size (A4, Letter, Legal, etc.)
+- `landscape`: true/false
+- `margin`: `{top, right, bottom, left}` in CSS units
+- `css`: Custom CSS (for markdown/html fragments)
+- `filename`: Suggested filename in Content-Disposition header
+
+## Auth
+Pass API key via `Authorization: Bearer <key>`. Set `API_KEYS` env var (comma-separated for multiple keys).
+
+## Docker
+```bash
+docker build -t docfast .
+docker run -p 3100:3100 -e API_KEYS=your-key docfast
+```