fix: appointmentStatus→status, missed call visibility, webhook callbackstatus, KB logging

- Renamed appointmentStatus to status in search + call-assist queries
- Missed calls worklist: removed agentName filter (shared FIFO queue)
- Webhook sets callbackstatus: PENDING_CALLBACK on missed calls
- AI chat: added KB content logging for debugging

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ai/ai-chat.controller.ts

@@ -64,6 +64,7 @@ export class AiChatController {
     private async buildKnowledgeBase(auth: string): Promise<string> {
         const now = Date.now();
         if (this.knowledgeBase && now - this.kbLoadedAt < this.kbTtlMs) {
+            this.logger.log(`KB cache hit (${this.knowledgeBase.length} chars, age ${Math.round((now - this.kbLoadedAt) / 1000)}s)`);
             return this.knowledgeBase;
         }
 
@@ -120,6 +121,7 @@ export class AiChatController {
             }
         } catch (err) {
             this.logger.warn(`Failed to fetch clinics: ${err}`);
+            sections.push('## Clinics\nFailed to load clinic data.');
         }
 
         try {
@@ -155,6 +157,7 @@ export class AiChatController {
             }
         } catch (err) {
             this.logger.warn(`Failed to fetch health packages: ${err}`);
+            sections.push('\n## Health Packages\nFailed to load package data.');
         }
 
         try {
@@ -175,6 +178,7 @@ export class AiChatController {
             }
         } catch (err) {
             this.logger.warn(`Failed to fetch insurance partners: ${err}`);
+            sections.push('\n## Insurance Partners\nFailed to load insurance data.');
         }
 
         this.knowledgeBase = sections.join('\n') || 'No hospital information available yet.';
@@ -202,7 +206,9 @@ ${kb}`;
 
     private async chatWithTools(userMessage: string, auth: string) {
         const kb = await this.buildKnowledgeBase(auth);
+        this.logger.log(`KB content preview: ${kb.substring(0, 300)}...`);
         const systemPrompt = this.buildSystemPrompt(kb);
+        this.logger.log(`System prompt length: ${systemPrompt.length} chars, user message: "${userMessage.substring(0, 100)}"`);
         const platformService = this.platform;
 
         const { text, steps } = await generateText({