fix(platform): fix ClamAV connectivity in Docker containers

clamd was only listening on 127.0.0.1 inside its container, so
container-to-container connections on the Docker network were refused.

- Add CLAMD_CONF_TCPAddr=0.0.0.0 to docker-compose so clamd binds
  to all interfaces
- Change default clamav_service_host from "localhost" to "clamav"
  (the docker-compose service name), matching how other services
  like redis, rabbitmq, supabase-db are referenced

autogpt_platform/backend/backend/util/virus_scanner.py

@@ -30,7 +30,7 @@ class VirusScanResult(BaseModel):
 
 class VirusScannerSettings(BaseSettings):
     # Tunables for the scanner layer (NOT the ClamAV daemon).
-    clamav_service_host: str = "localhost"
+    clamav_service_host: str = "clamav"
     clamav_service_port: int = 3310
     clamav_service_timeout: int = 60
     clamav_service_enabled: bool = True

autogpt_platform/docker-compose.yml

@@ -98,6 +98,7 @@ services:
       - CLAMD_CONF_MaxScanSize=100M
       - CLAMD_CONF_MaxThreads=12
       - CLAMD_CONF_ReadTimeout=300
+      - CLAMD_CONF_TCPAddr=0.0.0.0
     healthcheck:
       test: ["CMD-SHELL", "clamdscan --version || exit 1"]
       interval: 30s