BREAKING CHANGE(smart-proxy): move certificate persistence to an in-memory store and introduce consumer-managed certStore API; add default self-signed fallback cert and change ACME account handling

ts/core/models/common-types.ts

@@ -85,7 +85,6 @@ export interface IAcmeOptions {
   renewThresholdDays?: number;    // Days before expiry to renew certificates
   renewCheckIntervalHours?: number; // How often to check for renewals (in hours)
   autoRenew?: boolean;            // Whether to automatically renew certificates
-  certificateStore?: string;      // Directory to store certificates
   skipConfiguredCerts?: boolean;  // Skip domains with existing certificates
   domainForwards?: IDomainForwardConfig[]; // Domain-specific forwarding configs
 }