Update announcement system to use new dashboard messages table

Refactors the announcement storage and schema to utilize the new `dashboard_messages` table, renaming fields like `priority` to `type` and `groupId` to `storeId`, and updating sorting logic to reflect the new type system.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce/VpUPpsj

server/db.ts

@@ -49,14 +49,8 @@ if (isProduction && dbUrl && (dbUrl.includes('logiflow-db') || dbUrl.includes('l
   neonConfig.webSocketConstructor = ws.default;
   
   if (dbUrl) {
-    try {
-      pool = new Pool({ connectionString: dbUrl });
-      db = drizzle({ client: pool, schema });
-    } catch (error) {
-      console.error('❌ Neon connection failed, will use MemStorage:', error);
-      pool = null;
-      db = null;
-    }
+    pool = new Pool({ connectionString: dbUrl });
+    db = drizzle({ client: pool, schema });
   } else {
     // Create dummy instances for development
     pool = null;