feat: add Jitsi configuration settings

Add comprehensive Jitsi Meet configuration settings to settings.py
following the same pattern as WHEREBY settings.

- Add JITSI_DOMAIN with meet.jit.si default
- Add JITSI_JWT_SECRET for JWT token signing
- Add JITSI_WEBHOOK_SECRET for webhook validation
- Add JITSI_APP_ID, JITSI_JWT_ISSUER, JITSI_JWT_AUDIENCE for JWT configuration
- Follow consistent naming and typing patterns

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

server/reflector/settings.py

@@ -127,6 +127,14 @@ class Settings(BaseSettings):
     AWS_PROCESS_RECORDING_QUEUE_URL: str | None = None
     SQS_POLLING_TIMEOUT_SECONDS: int = 60
 
+    # Jitsi Meet
+    JITSI_DOMAIN: str = "meet.jit.si"
+    JITSI_JWT_SECRET: str | None = None
+    JITSI_WEBHOOK_SECRET: str | None = None
+    JITSI_APP_ID: str = "reflector"
+    JITSI_JWT_ISSUER: str = "reflector"
+    JITSI_JWT_AUDIENCE: str = "jitsi"
+
     # Zulip integration
     ZULIP_REALM: str | None = None
     ZULIP_API_KEY: str | None = None