Simplify seed data configuration by removing command line flags and renaming environment variable (#175)

This PR simplifies the seed data import configuration based on
maintainer feedback by removing command line flags and using a clearer
environment variable name.

## Key Changes

### Configuration Simplification
- **Renamed**: `MCP_REGISTRY_SEED_FILE_PATH` → `MCP_REGISTRY_SEED_FROM`
- **Removed**: `--seed-file-path` command line flag to eliminate
configuration complexity

### Improved User Experience
Users now configure seed data import using a single, clear environment
variable:

```bash
# Before (multiple ways to configure)
MCP_REGISTRY_SEED_FILE_PATH=data/seed.json ./registry
./registry --seed-file-path=data/seed.json

# After (simplified single method)
MCP_REGISTRY_SEED_FROM=data/seed.json ./registry
```

### Registry Composability
The composability workflow is now simplified while maintaining all
functionality:

```bash
# Start first registry with seed data
MCP_REGISTRY_SEED_FROM=data/seed.json ./registry

# Start second registry importing from first via pagination
MCP_REGISTRY_SEED_FROM=http://localhost:8080 ./registry
```

## Technical Implementation
- Maintains full backward compatibility for import functionality
- All existing seed data sources continue to work (local files, HTTP
URLs, registry URLs)
- Automatic pagination through `/v0/servers` endpoint remains unchanged
- Configurable delays between requests preserved

## Benefits
- **Reduced complexity**: Single configuration method instead of
multiple
- **Clearer naming**: `SEED_FROM` better describes the source of seed
data
- **Easier maintenance**: Fewer configuration paths to test and document
- **Consistent patterns**: Aligns with other environment-variable-only
configuration

All existing functionality is preserved while providing a cleaner, more
maintainable configuration interface.

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Avinash Sridhar <sridharavinash@users.noreply.github.com>
Co-authored-by: Toby Padilla <toby@toby.sh>
Co-authored-by: toby <83556+toby@users.noreply.github.com>

tools/publisher/main.go

@@ -103,7 +103,8 @@ func publishCommand() error {
 	publishFlags.StringVar(&registryURL, "registry-url", "", "URL of the registry (required)")
 	publishFlags.StringVar(&mcpFilePath, "mcp-file", "", "path to the MCP file (required)")
 	publishFlags.BoolVar(&forceLogin, "login", false, "force a new login even if a token exists")
-	publishFlags.StringVar(&authMethod, "auth-method", "github-oauth", "authentication method to use (default: github-oauth)")
+	publishFlags.StringVar(&authMethod, "auth-method", "github-oauth",
+		"authentication method to use (default: github-oauth)")
 
 	// Set custom usage function
 	publishFlags.Usage = func() {
@@ -210,16 +211,20 @@ func createCommand() error {
 	createFlags.StringVar(&execute, "e", "", "Command to execute the server (shorthand)")
 
 	// Custom flag for environment variables
-	createFlags.Func("env-var", "Environment variable in format NAME:DESCRIPTION (can be repeated)", func(value string) error {
-		envVars = append(envVars, value)
-		return nil
-	})
+	createFlags.Func("env-var",
+		"Environment variable in format NAME:DESCRIPTION (can be repeated)",
+		func(value string) error {
+			envVars = append(envVars, value)
+			return nil
+		})
 
 	// Custom flag for package arguments
-	createFlags.Func("package-arg", "Package argument in format VALUE:DESCRIPTION (can be repeated)", func(value string) error {
-		packageArgs = append(packageArgs, value)
-		return nil
-	})
+	createFlags.Func("package-arg",
+		"Package argument in format VALUE:DESCRIPTION (can be repeated)",
+		func(value string) error {
+			packageArgs = append(packageArgs, value)
+			return nil
+		})
 
 	// Set custom usage function
 	createFlags.Usage = func() {
@@ -240,7 +245,8 @@ func createCommand() error {
 		fmt.Fprint(os.Stdout, "  --package-version string Package version (defaults to server version)\n")
 		fmt.Fprint(os.Stdout, "  --runtime-hint string    Runtime hint (e.g., docker)\n")
 		fmt.Fprint(os.Stdout, "  --repo-source string     Repository source (default: github)\n")
-		fmt.Fprint(os.Stdout, "  --env-var string         Environment variable in format NAME:DESCRIPTION (can be repeated)\n")
+		fmt.Fprint(os.Stdout, "  --env-var string         Environment variable in format "+
+			"NAME:DESCRIPTION (can be repeated)\n")
 		fmt.Fprint(os.Stdout, "  --package-arg string     Package argument in format VALUE:DESCRIPTION (can be repeated)\n")
 	}
 
@@ -360,8 +366,11 @@ func publishToRegistry(registryURL string, mcpData []byte, token string) error {
 	return nil
 }
 
-func createServerStructure(name, description, version, repoURL, repoSource, registryName,
-	packageName, packageVersion, runtimeHint, execute string, envVars []string, packageArgs []string, status string) ServerJSON {
+func createServerStructure(
+	name, description, version, repoURL, repoSource, registryName,
+	packageName, packageVersion, runtimeHint, execute string,
+	envVars []string, packageArgs []string, status string,
+) ServerJSON {
 	// Parse environment variables
 	var environmentVariables []EnvironmentVariable
 	for _, envVar := range envVars {

tools/validate-examples/main.go

@@ -14,7 +14,7 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/santhosh-tekuri/jsonschema/v5"
+	jsonschema "github.com/santhosh-tekuri/jsonschema/v5"
 )
 
 const (

tools/validate-schemas/main.go

@@ -13,7 +13,7 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/santhosh-tekuri/jsonschema/v5"
+	jsonschema "github.com/santhosh-tekuri/jsonschema/v5"
 )
 
 func main() {