Initial caddy skill

SKILL.md

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+---
+name: caddy
+description: Caddy web server with automatic HTTPS
+metadata:
+  version: "1.0.0"
+  vibestack:
+    main: false
+---
+
+# Caddy Skill
+
+Installs and configures [Caddy](https://caddyserver.com/) web server with automatic HTTPS.
+
+## Features
+
+- Automatic HTTPS with Let's Encrypt
+- Reverse proxy support
+- Static file serving
+- Zero-downtime reloads
+
+## Configuration
+
+Create a `Caddyfile` in your skill's directory or set `CADDYFILE_PATH` environment variable.
+
+### Environment Variables
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `CADDYFILE_PATH` | Path to Caddyfile | `/skills/caddy/Caddyfile` |
+| `CADDY_DATA_DIR` | Caddy data directory | `/data/caddy` |
+
+## Example Caddyfile
+
+```caddyfile
+:80 {
+    respond "Hello from Caddy!"
+}
+
+# Reverse proxy example
+# api.example.com {
+#     reverse_proxy localhost:8080
+# }
+```
+
+## Usage
+
+This skill is typically used as a dependency by other skills that need a web server:
+
+```yaml
+metadata:
+  vibestack:
+    requires:
+      - caddy
+```