chore(platform): type predictive campaign events

What changed:
- Replaced predictive campaign-engine event-bus any casts with typed bus.emit calls.
- Preserved existing fire-and-forget event dispatch behavior with void emit calls.

Warning impact:
- services/platform-service/src/modules/predictive-analytics/campaign-engine.ts: no-explicit-any 5 -> 0.
- Workspace lint baseline: 189 warnings -> 184 warnings.

Verification:
- pnpm --filter @lysnrai/platform-service build
- pnpm --filter @lysnrai/platform-service exec eslint src/modules/predictive-analytics/campaign-engine.ts
- pnpm --filter @lysnrai/platform-service test
- pnpm --filter @lysnrai/platform-service exec eslint . --ext .ts,.tsx
- pnpm lint

services/platform-service/src/modules/predictive-analytics/campaign-engine.ts

@@ -128,7 +128,7 @@ export class CampaignEngine {
 
       // Emit event for tracking
       if (!testMode) {
-        (bus as any).emit('predictive.campaign.triggered', {
+        void bus.emit('predictive.campaign.triggered', {
           campaignId: campaign.id,
           userId: context.userId,
           productId: context.productId,
@@ -334,7 +334,7 @@ export class CampaignEngine {
       // In production, call delivery module
       // await deliveryService.sendEmail({...})
 
-      (bus as any).emit('delivery.email.requested', {
+      void bus.emit('delivery.email.requested', {
         userId: context.userId,
         productId: context.productId,
         templateId,
@@ -379,7 +379,7 @@ export class CampaignEngine {
       };
     }
 
-    (bus as any).emit('notifications.push.requested', {
+    void bus.emit('notifications.push.requested', {
       userId: context.userId,
       productId: context.productId,
       title: 'We miss you!',
@@ -413,7 +413,7 @@ export class CampaignEngine {
       };
     }
 
-    (bus as any).emit('notifications.inapp.create', {
+    void bus.emit('notifications.inapp.create', {
       userId: context.userId,
       productId: context.productId,
       title: 'Personalized for you',
@@ -474,7 +474,7 @@ export class CampaignEngine {
       ],
     };
 
-    (bus as any).emit('integrations.slack.notify', {
+    void bus.emit('integrations.slack.notify', {
       channel: '#customer-success',
       message,
     });