RHL-005-fix(env): update SESSION_SECRET placeholder in example environment files

.env.docker.example

@@ -11,7 +11,7 @@ MONGODB_URI=mongodb://mongo:27017/rhl_lieferscheine
 # Requirements: strong + random, at least 32 characters, never committed.
 # Example generation:
 #   openssl rand -base64 48
-SESSION_SECRET=63a3f50aac4fb8838e457d654348df5b
+SESSION_SECRET=replace-me-with-a-long-random-secret-string-at-least-32-chars
 
 # Must match the mount target inside the app container (read-only mount recommended).
 NAS_ROOT_PATH=/mnt/niederlassungen

.env.local.example

@@ -11,7 +11,7 @@ MONGODB_URI=mongodb://localhost:27017/rhl_lieferscheine
 # Requirements: strong + random, at least 32 characters, never committed.
 # Example generation:
 #   openssl rand -base64 48
-SESSION_SECRET=5ff5ecfddc3e3b8aad4a00a2dd637fea
+SESSION_SECRET=replace-me-with-a-long-random-secret-string-at-least-32-chars
 
 # Absolute Unix path to the NAS root folder that contains branch directories (NLxx/...).
 # For local dev you can point this to a local fixture folder.