Add auto-generated subdomain feature

When a base domain is configured on a host (e.g., apps.example.com),
deployments automatically get a subdomain ({name}.apps.example.com).
Custom --domain can still be provided to route both domains.

- Add BaseDomain field to Host state
- Add --base-domain flag to host init
- Add 'ship host set-domain' command to update base domain
- Update deploy flow to auto-generate subdomains
- Fix error display (errors were being silently swallowed)
- Remove placeholder email from Caddyfile template

1 files changed, 3 insertions, 1 deletions

diff --git a/cmd/ship/main.go b/cmd/ship/main.go
index 27fe8b7..a6984ec 100644
--- a/cmd/ship/main.go
+++ b/cmd/ship/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+        "fmt"
         "os"
 
         "github.com/bdw/ship/cmd/ship/env"
@@ -57,7 +58,7 @@ func init() {
         rootCmd.Flags().String("binary", "", "Path to Go binary (for app deployment)")
         rootCmd.Flags().Bool("static", false, "Deploy as static site")
         rootCmd.Flags().String("dir", ".", "Directory to deploy (for static sites)")
-        rootCmd.Flags().String("domain", "", "Domain name (required)")
+        rootCmd.Flags().String("domain", "", "Custom domain (optional if base domain configured)")
         rootCmd.Flags().String("name", "", "App name (default: inferred from binary or directory)")
         rootCmd.Flags().Int("port", 0, "Port override (default: auto-allocate)")
         rootCmd.Flags().StringArray("env", nil, "Environment variable (KEY=VALUE, can be specified multiple times)")
@@ -79,6 +80,7 @@ func init() {
 
 func main() {
         if err := rootCmd.Execute(); err != nil {
+                fmt.Fprintf(os.Stderr, "Error: %v\n", err)
                 os.Exit(1)
         }
 }