perf: cache-only strategy for list views, cache-then-cw for single fetch

- Add data-source hierarchy to opportunity manager (cache-only, cache-then-cw, cw-first)
- fetchPages/search/fetchByCompany use cache-only: Redis → DB (no CW calls)
- fetchItem uses cache-then-cw by default, cw-first when fresh=true
- Add idleTimeout: 255 to Bun.serve to prevent request timeouts
- Map CW status 57 (04. Confirmed Quote) to Active equivalency
- Add computeCacheTTL algorithm and opportunityCache module

src/modules/globalEvents.ts

@@ -178,6 +178,18 @@ interface EventTypes {
     staleCount: number;
   }) => void;
 
+  // Cache Events
+  "cache:opportunities:refresh:started": (data: {
+    totalOpportunities: number;
+  }) => void;
+  "cache:opportunities:refresh:completed": (data: {
+    totalOpportunities: number;
+    activitiesRefreshed: number;
+    companiesRefreshed: number;
+    skipped: number;
+  }) => void;
+  "cache:opportunities:refresh:error": (data: { error: unknown }) => void;
+
   // ConnectWise User Defined Fields Events
   "cw:udf:refresh:started": () => void;
   "cw:udf:refresh:completed": (data: { count: number }) => void;