feat(infra) : add monolog logging and persist logs in prod

Install symfony/monolog-bundle with rotating_file handlers.
Add named volume inventory_logs for prod log persistence.

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

symfony.lock

@@ -157,6 +157,18 @@
     "symfony/mcp-bundle": {
         "version": "v0.6.0"
     },
+    "symfony/monolog-bundle": {
+        "version": "4.0",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "3.7",
+            "ref": "1b9efb10c54cb51c713a9391c9300ff8bceda459"
+        },
+        "files": [
+            "config/packages/monolog.yaml"
+        ]
+    },
     "symfony/property-info": {
         "version": "8.0",
         "recipe": {