perf(pfapi): add cacheOnLoad option for ModelCtrl

Add cacheOnLoad config flag to ModelCfg that enables in-memory caching
after the first IndexedDB load. Previously, the cache was only populated
on save(), causing repeated DB reads for frequently-accessed models.

Enable cacheOnLoad for archiveYoung, which is loaded on every route
change via work-view component's async pipes for displaying archived
time worked and done task counts.

src/app/pfapi/api/model-ctrl/model-ctrl.ts

@@ -128,11 +128,22 @@ export class ModelCtrl<MT extends ModelBase> {
     PFLog.verbose(`${ModelCtrl.L}.${this.load.name}():${this.modelId}`, {
       inMemoryData: this._inMemoryData,
     });
-    return (
-      this._inMemoryData ||
-      ((await this._db.load(this.modelId)) as Promise<MT>) ||
-      (this.modelCfg.defaultData as MT)
-    );
+
+    // Return cached data if available
+    if (this._inMemoryData) {
+      return this._inMemoryData;
+    }
+
+    // Load from database
+    const dbData = (await this._db.load(this.modelId)) as MT | undefined;
+    const result = dbData || (this.modelCfg.defaultData as MT);
+
+    // Cache if configured
+    if (this.modelCfg.cacheOnLoad && result) {
+      this._inMemoryData = result;
+    }
+
+    return result;
   }
 
   /**

src/app/pfapi/api/pfapi.model.ts

@@ -28,6 +28,13 @@ export interface ModelCfg<T extends ModelBase> {
   debounceDbWrite?: number;
   isMainFileModel?: boolean;
 
+  /**
+   * When true, ModelCtrl.load() will cache the result from IndexedDB
+   * in memory for subsequent reads. Useful for frequently-read models.
+   * Default: false (current behavior - no caching on load).
+   */
+  cacheOnLoad?: boolean;
+
   validate?: <R>(data: R | T) => IValidation<R | T>;
   repair?: <R>(data: R | unknown | any) => T;
 

src/app/pfapi/pfapi-config.ts

@@ -196,6 +196,7 @@ export const PFAPI_MODEL_CFGS: PfapiAllModelCfg = {
         task: fixEntityStateConsistency(d.task),
       };
     },
+    cacheOnLoad: true,
   },
   archiveOld: {
     defaultData: {