fix: camelCase field names + dial uses per-agent config

Defect 5: Worklist, missed-call-webhook, missed-queue, ai-chat, and
rules-engine all used legacy lowercase field names (callbackstatus,
callsourcenumber, missedcallcount, callbackattemptedat) from the old
VPS schema. Fixed to camelCase (callbackStatus, callSourceNumber,
missedCallCount, callbackAttemptedAt) matching the current SDK sync.

Defect 6: Dial endpoint used global defaults (OZONETEL_AGENT_ID env
var) instead of the logged-in agent's config. Now accepts agentId
and campaignName from the frontend request body. Falls back to
telephony config → DID-derived campaign name → explicit error.

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

src/ai/ai-chat.controller.ts

@@ -271,7 +271,7 @@ export class AiChatController {
                 inputSchema: z.object({}),
                 execute: async () => {
                     const data = await platformService.queryWithAuth<any>(
-                        `{ calls(first: 100, filter: { callStatus: { eq: MISSED }, callbackstatus: { eq: PENDING_CALLBACK } }) { edges { node { id callerNumber { primaryPhoneNumber } startedAt agentName sla } } } }`,
+                        `{ calls(first: 100, filter: { callStatus: { eq: MISSED }, callbackStatus: { eq: PENDING_CALLBACK } }) { edges { node { id callerNumber { primaryPhoneNumber } startedAt agentName sla } } } }`,
                         undefined, auth,
                     );
                     const breached = data.calls.edges