feat: call control, recording, CDR, missed calls, live call assist

- Call Control API (CONFERENCE/HOLD/MUTE/KICK_CALL)
- Recording pause/unpause
- Fetch CDR Detailed (call history with recordings)
- Abandon Calls (missed calls from Ozonetel)
- Call Assist WebSocket gateway (Deepgram STT + OpenAI suggestions)
- Call Assist service (lead context loading)

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

package-lock.json

@@ -11,6 +11,7 @@
       "dependencies": {
         "@ai-sdk/anthropic": "^3.0.58",
         "@ai-sdk/openai": "^3.0.41",
+        "@deepgram/sdk": "^5.0.0",
         "@nestjs/common": "^11.0.1",
         "@nestjs/config": "^4.0.3",
         "@nestjs/core": "^11.0.1",
@@ -833,6 +834,18 @@
         "@jridgewell/sourcemap-codec": "^1.4.10"
       }
     },
+    "node_modules/@deepgram/sdk": {
+      "version": "5.0.0",
+      "resolved": "http://localhost:4873/@deepgram/sdk/-/sdk-5.0.0.tgz",
+      "integrity": "sha512-x1wMiOgDGqcLEaQpQBQLTtk5mLbXbYgcBEpp7cfJIyEtqdIGgijCZH+a/esiVp+xIcTYYroTxG47RVppZOHbWw==",
+      "license": "MIT",
+      "dependencies": {
+        "ws": "^8.16.0"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/@emnapi/core": {
       "version": "1.9.0",
       "resolved": "http://localhost:4873/@emnapi/core/-/core-1.9.0.tgz",