fix(model): add backward compatibility for deprecated ccotel config key

Support both ccotel (deprecated) and aiCodeOtel config keys to ensure
users with existing configs using the old key continue to work after
upgrading. The migration happens silently at config read time.

- Add deprecated CCOtel field to ShellTimeConfig with old tags
- Migrate ccotel to AICodeOtel in ReadConfigFile after unmarshal
- Handle deprecated field in mergeConfig for local config overrides

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: AnnatarHe

model/config.go

@@ -154,6 +154,10 @@ func mergeConfig(base, local *ShellTimeConfig) {
 	if local.CCUsage != nil {
 		base.CCUsage = local.CCUsage
 	}
+	// Migrate deprecated ccotel from local config
+	if local.CCOtel != nil && local.AICodeOtel == nil {
+		local.AICodeOtel = local.CCOtel
+	}
 	if local.AICodeOtel != nil {
 		base.AICodeOtel = local.AICodeOtel
 	}
@@ -213,6 +217,12 @@ func (cs *configService) ReadConfigFile(ctx context.Context, opts ...ReadConfigO
 		return
 	}
 
+	// Migrate deprecated ccotel field to AICodeOtel (silent migration)
+	if config.CCOtel != nil && config.AICodeOtel == nil {
+		config.AICodeOtel = config.CCOtel
+		config.CCOtel = nil
+	}
+
 	// Read and merge local config if exists
 	if files.localFile != "" {
 		if localConfig, localErr := os.ReadFile(files.localFile); localErr == nil {

model/types.go

@@ -81,6 +81,10 @@ type ShellTimeConfig struct {
 	// CCUsage configuration for Claude Code usage tracking (v1 - ccusage CLI based)
 	CCUsage *CCUsage `toml:"ccusage" yaml:"ccusage" json:"ccusage"`
 
+	// CCOtel is deprecated, use AICodeOtel instead
+	// Deprecated: This field will be removed in a future version
+	CCOtel *AICodeOtel `toml:"ccotel" yaml:"ccotel" json:"ccotel"`
+
 	// AICodeOtel configuration for OTEL-based AI CLI tracking (Claude Code, Codex, etc.)
 	AICodeOtel *AICodeOtel `toml:"aiCodeOtel" yaml:"aiCodeOtel" json:"aiCodeOtel"`
 
@@ -118,6 +122,7 @@ var DefaultConfig = ShellTimeConfig{
 	AI:            DefaultAIConfig,
 	Exclude:       []string{},
 	CCUsage:       nil,
+	CCOtel:        nil, // deprecated
 	AICodeOtel:    nil,
 	CodeTracking:  nil,
 	LogCleanup:    nil,