fix : resolve Docker port conflicts and fix var/ permissions on install

Port PG 5436→5437, port frontend 3003→3005 to avoid conflicts with Coltura.
Add fix-permissions target in Makefile to create var/cache and var/log as root before composer install.

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

docker-compose.yml

@@ -32,7 +32,7 @@ services:
     depends_on:
       - db
     ports:
-        - "3003:3003"
+        - "3005:3003"
     restart: unless-stopped
   nginx:
     image: nginx:1.27-alpine
@@ -47,7 +47,7 @@ services:
     restart: unless-stopped
   db:
     image: postgres:16-alpine
-    command: -p ${POSTGRES_PORT:-5436}
+    command: -p ${POSTGRES_PORT:-5437}
     environment:
       POSTGRES_DB: ${POSTGRES_DB}
       POSTGRES_USER: ${POSTGRES_USER}
@@ -55,7 +55,7 @@ services:
     volumes:
       - pg_data:/var/lib/postgresql/data
     ports:
-      - "${POSTGRES_PORT:-5436}:${POSTGRES_PORT:-5436}"
+      - "${POSTGRES_PORT:-5437}:${POSTGRES_PORT:-5437}"
     restart: unless-stopped
 volumes:
   pg_data: