Fix synapse retention-config placement in values

- Move retention-config from top-level synapse to additional section
- Helm Chart schema requires custom configs under synapse.additional
- Clean up comments (keep inline comments minimal)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

apps/production/custom-configs/synapse-values.yaml

@@ -23,29 +23,28 @@ data:
             - 'fe80::/10'
             - 'fc00::/7'
             max_spider_size: 10M
+        retention-config:
+          config: |
+            retention:
+              enabled: true
+              default_policy:
+                min_lifetime: 1d
+                max_lifetime: 1y
+              allowed_lifetime_min: 1d
+              allowed_lifetime_max: 2y
+              purge_jobs:
+                - longest_max_lifetime: 3d
+                  interval: 12h
+                - shortest_max_lifetime: 3d
+                  longest_max_lifetime: 1w
+                  interval: 1d
+                - shortest_max_lifetime: 1w
+                  interval: 2d
 
-      retention-config:
+            media_retention:
-        config: |
+              local_media_lifetime: 365d
-          retention:
+              remote_media_lifetime: 90d
-            enabled: true
-            default_policy:
-              min_lifetime: 1d
-              max_lifetime: 1y    # Nachrichten älter als 1 Jahr werden gelöscht
-            allowed_lifetime_min: 1d   # Minimum, das Räume setzen können
-            allowed_lifetime_max: 2y   # Maximum, das Räume setzen können
-            purge_jobs:
-              - longest_max_lifetime: 3d
-                interval: 12h
-              - shortest_max_lifetime: 3d
-                longest_max_lifetime: 1w
-                interval: 1d
-              - shortest_max_lifetime: 1w
-                interval: 2d
 
-          media_retention:
+            redaction_retention_period: 7d
-            local_media_lifetime: 365d    # Lokale Medien nach 1 Jahr löschen
+            forgotten_room_retention_period: 28d
-            remote_media_lifetime: 90d    # Remote-Cache nach 90 Tagen löschen
+            user_ips_max_age: 90d
-
-          redaction_retention_period: 7d
-          forgotten_room_retention_period: 28d
-          user_ips_max_age: 90d