perf: add performance optimizations for SMB

- dead time = 30: disconnect idle clients to free resources
- large readwrite = yes: improved large file transfer performance
- max xmit = 65535: maximum packet size for better throughput
- write cache size = 1048576: 1MB write cache for write performance

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

CHANGELOG.md

@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Added
+
+- **Performance optimizations** (Dockerfile)
+  - `dead time = 30` — disconnect idle clients after 30 seconds to free resources
+  - `large readwrite = yes` — improved performance for large file transfers
+  - `max xmit = 65535` — maximum packet size for better throughput
+  - `write cache size = 1048576` — 1MB write cache for improved write performance
+
 ### Fixed
 
 - **Fixed chown syntax error in perms function** (samba.sh:122)

Dockerfile

@@ -52,6 +52,10 @@ RUN file="/etc/samba/smb.conf" && \
    smb2 max write = 8388608
    smb2 max trans = 8388608
    smb2 max credits = 8192
+   dead time = 30
+   large readwrite = yes
+   max xmit = 65535
+   write cache size = 1048576
    vfs objects = catia recycle
 
    # Recycle bin