refactor: P0-P3 fixes, C1 cleanup, architecture diagrams, go.work upgrade

- P0-1: ProviderError type + ReportStatus for precise 401/403 detection
- P0-2: Remove -config flag from deploy/homeagent.service
- P2-1: 5s debounce on context.go Save()
- P2-2→C1: Delete output_set_channel entirely
- P2-3: Extract mediaDataURL/mediaChat helpers
- P2-4: Dedup defaultSources var
- P3: Delete dead packages (embed/tokenizer/container/snapshot)
- P3: Delete dead functions (messagesToMap, RunStageAll)
- CL: Update .gitignore, docs, Makefile, gojieba removal
- Config: Delete config/config.yaml, update docs
- Arch: Remove EmitOutputTo from emitResponse
- CL-1: go.work 1.19→1.21
- Docs: Add Mermaid architecture diagrams to README
- Docs: Add kernel-rebuild requires plugin-rebuild note to PLUGIN_DEV.md

internal/sdk/settings_impl.go

@@ -0,0 +1,102 @@
+package sdk
+
+import (
+	"fmt"
+	internalConfig "gitcode.com/JianFeeeee/HomeAgent/internal/config"
+)
+
+type settingsImpl struct {
+	pluginName string
+	reg        *internalConfig.ConfigRegistry
+}
+
+func NewSettings(name string, reg *internalConfig.ConfigRegistry) SettingsAPI {
+	return &settingsImpl{pluginName: name, reg: reg}
+}
+
+func (s *settingsImpl) Get(key string) (interface{}, error) {
+	if s.reg == nil { return nil, nil }
+	return s.reg.PluginConfig(s.pluginName).Get(key)
+}
+func (s *settingsImpl) Set(key string, value interface{}) error {
+	if s.reg == nil { return nil }
+	return s.reg.PluginConfig(s.pluginName).Set(key, value)
+}
+func (s *settingsImpl) List(prefix string) ([]string, error) {
+	if s.reg == nil { return nil, nil }
+	return s.reg.PluginConfig(s.pluginName).List(prefix)
+}
+func (s *settingsImpl) GetCore(key string) (interface{}, error) {
+	if s.reg == nil { return nil, nil }
+	return s.reg.Get(key)
+}
+func (s *settingsImpl) SetCore(key string, value interface{}) error {
+	if s.reg == nil { return nil }
+	return s.reg.Set(key, value)
+}
+func (s *settingsImpl) ListCore(prefix string) ([]string, error) {
+	if s.reg == nil { return nil, nil }
+	return s.reg.List(prefix), nil
+}
+func (s *settingsImpl) GetPlugin(plugin, key string) (interface{}, error) {
+	if s.reg == nil { return nil, nil }
+	return s.reg.PluginConfig(plugin).Get(key)
+}
+func (s *settingsImpl) SetPlugin(plugin, key string, value interface{}) error {
+	if s.reg == nil { return nil }
+	return s.reg.PluginConfig(plugin).Set(key, value)
+}
+func (s *settingsImpl) ListPlugin(plugin, prefix string) ([]string, error) {
+	if s.reg == nil { return nil, nil }
+	return s.reg.PluginConfig(plugin).List(prefix)
+}
+func (s *settingsImpl) RegisterDef(def ConfigDef) {
+	if s.reg == nil { return }
+	s.reg.PluginConfig(s.pluginName).RegisterDef(internalConfig.ConfigDef{
+		Key: def.Key, Type: def.Type, DisplayName: def.DisplayName, Description: def.Description,
+		Category: def.Category, Options: def.Options,
+		Default: stringifyDefault(def.Default),
+	})
+}
+func (s *settingsImpl) Defs(prefix string) []*ConfigDef {
+	if s.reg == nil { return nil }
+	defs := s.reg.PluginConfig(s.pluginName).ListDefs(prefix)
+	out := make([]*ConfigDef, len(defs))
+	for i, d := range defs {
+		// ConfigDef = pubsdk.ConfigDef (type alias), so direct conversion works
+		cpy := ConfigDef{
+			Key: d.Key, Type: d.Type, DisplayName: d.DisplayName, Description: d.Description,
+			Category: d.Category, Options: d.Options,
+		}
+		out[i] = &cpy
+	}
+	return out
+}
+func (s *settingsImpl) Dump() map[string]interface{} {
+	if s.reg == nil { return nil }
+	return s.reg.Dump()
+}
+func (s *settingsImpl) Plugins() []string {
+	if s.reg == nil { return nil }
+	keys := s.reg.List("config_")
+	names := make([]string, 0, len(keys)+1)
+	names = append(names, "core")
+	for _, k := range keys {
+		if len(k) > 7 { names = append(names, k[7:]) }
+	}
+	return names
+}
+
+func stringifyDefault(v interface{}) string {
+	if v == nil { return "" }
+	switch x := v.(type) {
+	case string: return x
+	case bool:
+		if x { return "true" }
+		return "false"
+	default: return fmt.Sprint(v)
+	}
+}
+
+// Ensure settingsImpl satisfies SettingsAPI (pubsdk.SettingsAPI via type alias).
+var _ SettingsAPI = (*settingsImpl)(nil)