Release v0.9.75 runtime and onboarding update

Ship the 0.9.75 source update with improved startup/runtime hardening, operator API key onboarding, Meshtastic MQTT controls, Infonet/MeshChat separation, desktop package versioning, and aircraft telemetry refinements.

Also updates focused backend/frontend tests for node settings, Meshtastic MQTT settings, and desktop runtime behavior.

frontend/src/types/dashboard.ts

@@ -114,6 +114,7 @@ export interface Ship {
   source_url?: string;
   last_osint_update?: string;
   desc?: string;
+  trail?: Array<{ lat: number; lng: number; sog?: number; ts?: number } | number[]>;
   // Tracked yacht enrichment
   yacht_alert?: boolean;
   yacht_owner?: string;