feat(config): add jobs.mcp_tokens_purge config (spec §6.6)

Default: enabled=true, interval=24h, retention=168h (7 days).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config.example.yaml

@@ -102,6 +102,10 @@ jobs:
     enabled: true
     interval: 24h
     retention: 168h          # 7 天
+  mcp_tokens_purge:
+    enabled: true
+    interval: 24h
+    retention: 168h  # 7 days
 
 # 通知通道配置
 notify:

internal/config/config.go

@@ -122,6 +122,7 @@ type JobsConfig struct {
 	JobReaper         JobReaperCfg         `mapstructure:"job_reaper"`
 	JobPurge          JobPurgeCfg          `mapstructure:"job_purge"`
 	AcpEventsPurge    AcpEventsPurgeCfg    `mapstructure:"acp_events_purge"`
+	MCPTokensPurge    MCPTokensPurgeCfg    `mapstructure:"mcp_tokens_purge"`
 }
 
 type RunnerCfg struct {
@@ -160,6 +161,12 @@ type AcpEventsPurgeCfg struct {
 	Retention time.Duration `mapstructure:"retention"`
 }
 
+type MCPTokensPurgeCfg struct {
+	Enabled   bool          `mapstructure:"enabled"`
+	Interval  time.Duration `mapstructure:"interval"`
+	Retention time.Duration `mapstructure:"retention"`
+}
+
 // NotifyConfig 是 notify 模块的可选外发通道配置。当前仅 webhook。
 type NotifyConfig struct {
 	Webhook WebhookCfg `mapstructure:"webhook"`
@@ -252,6 +259,9 @@ func Load(configFile string) (*Config, error) {
 	v.SetDefault("jobs.acp_events_purge.enabled", true)
 	v.SetDefault("jobs.acp_events_purge.interval", "24h")
 	v.SetDefault("jobs.acp_events_purge.retention", "168h")
+	v.SetDefault("jobs.mcp_tokens_purge.enabled", true)
+	v.SetDefault("jobs.mcp_tokens_purge.interval", "24h")
+	v.SetDefault("jobs.mcp_tokens_purge.retention", "168h")
 	v.SetDefault("notify.webhook.enabled", false)
 	v.SetDefault("notify.webhook.timeout", "10s")
 	v.SetDefault("acp.enabled", true)