feat: Initial Porkbun DNS MCP Light server

- 3 specific tools: ping, list_domains, list_dns_records
- 1 pass-through tool: porkbun_api for full API access
- Safety system with READ/WRITE/INFRA access levels
- Embedded API documentation as MCP resource
- Starlette wrapper with /health endpoint
- Gitea Actions CI workflow for Docker build

README.md

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+# Porkbun DNS MCP
+
+A lightweight MCP server for managing DNS records via the Porkbun API.
+
+## Features
+
+- **3 specific tools** for common operations (ping, list domains, list DNS records)
+- **1 pass-through tool** for full API access
+- **Safety system** with READ/WRITE/INFRA access levels
+- **Embedded API documentation** as MCP resource
+
+## Safety Levels
+
+| Level | Operations | Environment Variable |
+|-------|-----------|---------------------|
+| READ | List domains, retrieve records, ping | Default |
+| WRITE | Create/edit/delete DNS records, DNSSEC | `PORKBUN_ALLOW_WRITES=true` |
+| INFRA | Nameserver changes, glue records | `PORKBUN_ALLOW_INFRA=true` |
+
+## Quick Start
+
+### Local Development
+
+```bash
+# Create .env from template
+cp .env.example .env
+
+# Add your Porkbun API keys to .env
+# Get keys at: https://porkbun.com/account/api
+
+# Install dependencies
+uv pip install -e .
+
+# Run server
+python server.py
+```
+
+### Docker
+
+```bash
+docker run -d \
+  -e PORKBUN_API_KEY=pk1_xxx \
+  -e PORKBUN_SECRET_KEY=sk1_xxx \
+  -e PORKBUN_ALLOW_WRITES=false \
+  -p 8000:8000 \
+  gitea.ext.ben.io/b3nw/porkbun-dns-mcp:latest
+```
+
+## MCP Tools
+
+### `ping`
+Test API connectivity and return your public IP address.
+
+### `list_domains`
+List all domains in your Porkbun account.
+
+### `list_dns_records`
+Retrieve DNS records for a specific domain.
+
+### `porkbun_api`
+Execute any Porkbun API call. Refer to the `porkbun://api-reference` resource for endpoint documentation.
+
+## MCP Resources
+
+- `porkbun://api-reference` - Full API documentation
+- `porkbun://safety-status` - Current safety configuration
+
+## Configuration
+
+| Variable | Required | Default | Description |
+|----------|----------|---------|-------------|
+| `PORKBUN_API_KEY` | Yes | - | Porkbun API key |
+| `PORKBUN_SECRET_KEY` | Yes | - | Porkbun secret key |
+| `PORKBUN_ALLOW_WRITES` | No | `false` | Enable write operations |
+| `PORKBUN_ALLOW_INFRA` | No | `false` | Enable infrastructure changes |
+| `PORT` | No | `8000` | Server port |
+
+## Endpoints
+
+- `GET /health` - Health check
+- `POST /mcp/` - MCP SSE endpoint