feat: initial release of muyue - AI-powered dev environment assistant

Complete implementation of muyue v0.1.0, a single-binary Go tool that
transforms the development environment with AI-powered orchestration.

Core features:
- TUI with 5 tabs (Dashboard/Chat/Workflow/Agents/Config) using Charm stack
- AI chat via MiniMax M2.7 with async message handling
- Structured Plan→Execute workflow engine (gather→plan→review→execute)
- System scanner detecting 14 tools + 8 runtimes across Linux/macOS/Windows
- Auto-installer for Crush, Claude Code, BMAD, Starship, runtimes
- Background update daemon with hourly checks
- LSP auto-config for 16 language servers
- MCP auto-config for 12 servers (deployed to Crush + Claude Code)
- Skills system with 5 built-ins + AI-powered generation
- Crush/Claude Code proxy for unified control
- HTML preview server for visual outputs
- First-time setup wizard with interactive profiling
- Cross-platform: Linux (primary), macOS, Windows, WSL

CI/CD:
- GitHub Actions CI: build + test + lint on Linux/macOS/Windows
- Release workflow: cross-compile 6 binaries with checksums on tag push

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

internal/config/config.go

@@ -0,0 +1,167 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Profile struct {
+	Name        string   `yaml:"name"`
+	Pseudo      string   `yaml:"pseudo"`
+	Email       string   `yaml:"email"`
+	Languages   []string `yaml:"languages"`
+	Preferences struct {
+		Editor        string `yaml:"editor"`
+		Shell         string `yaml:"shell"`
+		Theme         string `yaml:"theme"`
+		DefaultAI     string `yaml:"default_ai"`
+		AutoUpdate    bool   `yaml:"auto_update"`
+		CheckOnStart  bool   `yaml:"check_on_start"`
+	} `yaml:"preferences"`
+}
+
+type AIProvider struct {
+	Name     string `yaml:"name"`
+	APIKey   string `yaml:"api_key,omitempty"`
+	BaseURL  string `yaml:"base_url,omitempty"`
+	Model    string `yaml:"model"`
+	Active   bool   `yaml:"active"`
+}
+
+type ToolConfig struct {
+	Name      string `yaml:"name"`
+	Installed bool   `yaml:"installed"`
+	Version   string `yaml:"version"`
+	AutoUpdate bool  `yaml:"auto_update"`
+}
+
+type MuyueConfig struct {
+	Version   string               `yaml:"version"`
+	Profile   Profile              `yaml:"profile"`
+	AI        struct {
+		Providers []AIProvider      `yaml:"providers"`
+	} `yaml:"ai"`
+	Tools     []ToolConfig         `yaml:"tools"`
+	BMAD      struct {
+		Installed bool   `yaml:"installed"`
+		Version   string `yaml:"version"`
+		Global    bool   `yaml:"global"`
+	} `yaml:"bmad"`
+	Terminal struct {
+		CustomPrompt bool   `yaml:"custom_prompt"`
+		PromptTheme  string `yaml:"prompt_theme"`
+	} `yaml:"terminal"`
+}
+
+func ConfigDir() (string, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+	dir := filepath.Join(home, ".muyue")
+	return dir, nil
+}
+
+func ConfigPath() (string, error) {
+	dir, err := ConfigDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(dir, "config.yaml"), nil
+}
+
+func Exists() bool {
+	path, err := ConfigPath()
+	if err != nil {
+		return false
+	}
+	_, err = os.Stat(path)
+	return err == nil
+}
+
+func Load() (*MuyueConfig, error) {
+	path, err := ConfigPath()
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading config: %w", err)
+	}
+
+	var cfg MuyueConfig
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parsing config: %w", err)
+	}
+
+	return &cfg, nil
+}
+
+func Save(cfg *MuyueConfig) error {
+	dir, err := ConfigDir()
+	if err != nil {
+		return err
+	}
+
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return fmt.Errorf("creating config dir: %w", err)
+	}
+
+	path := filepath.Join(dir, "config.yaml")
+	data, err := yaml.Marshal(cfg)
+	if err != nil {
+		return fmt.Errorf("marshaling config: %w", err)
+	}
+
+	if err := os.WriteFile(path, data, 0600); err != nil {
+		return fmt.Errorf("writing config: %w", err)
+	}
+
+	return nil
+}
+
+func Default() *MuyueConfig {
+	cfg := &MuyueConfig{
+		Version: "0.1.0",
+		Profile: Profile{
+			Name:   "",
+			Pseudo: "muyue",
+			Languages: []string{},
+		},
+	}
+
+	cfg.Profile.Preferences.DefaultAI = "minimax"
+	cfg.Profile.Preferences.AutoUpdate = true
+	cfg.Profile.Preferences.CheckOnStart = true
+	cfg.Profile.Preferences.Theme = "charm"
+
+	cfg.AI.Providers = []AIProvider{
+		{
+			Name:    "minimax",
+			Model:   "MiniMax-M2.7",
+			BaseURL: "https://api.minimax.io/v1",
+			Active:  true,
+		},
+		{
+			Name:    "zai",
+			Model:   "glm",
+			Active:  false,
+		},
+		{
+			Name:    "anthropic",
+			Model:   "claude-sonnet-4-20250514",
+			Active:  false,
+		},
+	}
+
+	cfg.BMAD.Global = true
+
+	cfg.Terminal.CustomPrompt = true
+	cfg.Terminal.PromptTheme = "zerotwo"
+
+	return cfg
+}