feat: ajout Postfix, Rspamd et ClamAV dans docker-compose-dev

Services internes (aucun port exposé sur l'hôte) :
- Postfix (boky/postfix) : SMTP interne, hostname mail.siteconseil.local,
  domaines autorisés siteconseil.fr/siteconseil.local, milter vers Rspamd
  sur port 11332, healthcheck via postfix status
- Rspamd (rspamd/rspamd) : filtrage spam/phishing, connecté à ClamAV,
  milter protocol 6 pour Postfix
- ClamAV (clamav/clamav:stable) : antivirus, healthcheck clamdcheck,
  start_period 120s pour le téléchargement initial des signatures

Chaîne : PHP → Postfix:25 → Rspamd:11332 → ClamAV:3310
Volumes persistants : postfix-data, rspamd-data, clamav-data

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

docker-compose-dev.yml

@@ -184,6 +184,57 @@ services:
       redis:
         condition: service_healthy
 
+  postfix:
+    image: boky/postfix:latest
+    container_name: crm_siteconseil_postfix
+    restart: unless-stopped
+    hostname: mail.siteconseil.local
+    environment:
+      ALLOWED_SENDER_DOMAINS: siteconseil.fr siteconseil.local
+      RELAYHOST: ""
+      POSTFIX_myhostname: mail.siteconseil.local
+      POSTFIX_mydestination: siteconseil.local, localhost
+      POSTFIX_mynetworks: "10.0.0.0/8 172.16.0.0/12 192.168.0.0/16"
+      POSTFIX_smtpd_milters: "inet:rspamd:11332"
+      POSTFIX_non_smtpd_milters: "inet:rspamd:11332"
+      POSTFIX_milter_protocol: "6"
+      POSTFIX_milter_default_action: "accept"
+    volumes:
+      - postfix-data:/var/spool/postfix
+    depends_on:
+      rspamd:
+        condition: service_started
+    healthcheck:
+      test: ["CMD-SHELL", "postfix status || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  rspamd:
+    image: rspamd/rspamd:latest
+    container_name: crm_siteconseil_rspamd
+    restart: unless-stopped
+    volumes:
+      - rspamd-data:/var/lib/rspamd
+    depends_on:
+      clamav:
+        condition: service_healthy
+    environment:
+      - CLAMAV_HOST=clamav
+
+  clamav:
+    image: clamav/clamav:stable
+    container_name: crm_siteconseil_clamav
+    restart: unless-stopped
+    volumes:
+      - clamav-data:/var/lib/clamav
+    healthcheck:
+      test: ["CMD-SHELL", "clamdcheck || echo 0"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 120s
+
 volumes:
   db-data:
   redis-data:
@@ -191,3 +242,6 @@ volumes:
   vault-data:
   meilisearch-data:
   libretranslate-data:
+  postfix-data:
+  rspamd-data:
+  clamav-data: