feat(config): add typed module-input fields with defaults

internal/config/config.go

@@ -14,12 +14,50 @@ import (
 //go:embed defaults.yaml
 var defaultsYAML []byte
 
+type Packages struct {
+	Base []string `yaml:"base"`
+}
+type ArduinoCLIConfig struct {
+	Version string   `yaml:"version"`
+	URL     string   `yaml:"url"`
+	Cores   []string `yaml:"cores"`
+}
+type ZshPlugin struct {
+	Name string `yaml:"name"`
+	Repo string `yaml:"repo"`
+}
+type ZshConfig struct {
+	OhMyZshRepo string      `yaml:"oh_my_zsh_repo"`
+	Plugins     []ZshPlugin `yaml:"plugins"`
+}
+type ZellijConfig struct {
+	ConfigURL string `yaml:"config_url"`
+}
+type ThemesConfig struct {
+	Source string `yaml:"source"`
+}
+type ShellConfigBlock struct {
+	Name    string `yaml:"name"`
+	File    string `yaml:"file"`
+	Content string `yaml:"content"`
+}
+type ShellConfigSection struct {
+	Blocks []ShellConfigBlock `yaml:"blocks"`
+}
+
 // Config is the fully-resolved runtime configuration.
 type Config struct {
-	Version         int               `yaml:"version"`
-	ExtraPackages   []string          `yaml:"extra_packages"`
-	DisabledModules []string          `yaml:"disabled_modules"`
-	ThemeOverrides  map[string]string `yaml:"theme_overrides"`
+	Version         int                `yaml:"version"`
+	ExtraPackages   []string           `yaml:"extra_packages"`
+	DisabledModules []string           `yaml:"disabled_modules"`
+	ThemeOverrides  map[string]string  `yaml:"theme_overrides"`
+	Packages        Packages           `yaml:"packages"`
+	Fonts           []string           `yaml:"fonts"`
+	ArduinoCLI      ArduinoCLIConfig   `yaml:"arduino_cli"`
+	Zsh             ZshConfig          `yaml:"zsh"`
+	Zellij          ZellijConfig       `yaml:"zellij"`
+	Themes          ThemesConfig       `yaml:"themes"`
+	ShellConfig     ShellConfigSection `yaml:"shell_config"`
 }
 
 const currentVersion = 1
@@ -78,5 +116,26 @@ func merge(base, over Config) Config {
 		}
 		out.ThemeOverrides = merged
 	}
+	if len(over.Packages.Base) > 0 {
+		out.Packages = over.Packages
+	}
+	if len(over.Fonts) > 0 {
+		out.Fonts = over.Fonts
+	}
+	if over.ArduinoCLI.Version != "" {
+		out.ArduinoCLI = over.ArduinoCLI
+	}
+	if over.Zsh.OhMyZshRepo != "" {
+		out.Zsh = over.Zsh
+	}
+	if over.Zellij.ConfigURL != "" {
+		out.Zellij = over.Zellij
+	}
+	if over.Themes.Source != "" {
+		out.Themes = over.Themes
+	}
+	if len(over.ShellConfig.Blocks) > 0 {
+		out.ShellConfig = over.ShellConfig
+	}
 	return out
 }