feat: Add configurable restart policy, default to on-failure

- Changed restart policy from unless-stopped to on-failure
  so Windows shutdown stops the container instead of restarting
- Added RESTART_POLICY env variable to .env.modern and .env.legacy
- Compose files use ${RESTART_POLICY:-on-failure} for flexibility
- Updated WINCTL_GUIDE.md with restart policy documentation
- Updated readme.md with RESTART_POLICY setting

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

compose/desktop/win10.yml

@@ -16,7 +16,7 @@ services:
       - 3310:3389/udp
     volumes:
       - ../../data/win10:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m
 
   win10e:
@@ -36,7 +36,7 @@ services:
       - 3314:3389/udp
     volumes:
       - ../../data/win10e:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m
 
   win10l:
@@ -56,5 +56,5 @@ services:
       - 3315:3389/udp
     volumes:
       - ../../data/win10l:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m

compose/desktop/win11.yml

@@ -16,7 +16,7 @@ services:
       - 3311:3389/udp
     volumes:
       - ../../data/win11:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m
 
   win11e:
@@ -36,7 +36,7 @@ services:
       - 3312:3389/udp
     volumes:
       - ../../data/win11e:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m
 
   win11l:
@@ -56,5 +56,5 @@ services:
       - 3313:3389/udp
     volumes:
       - ../../data/win11l:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m

compose/desktop/win7.yml

@@ -16,7 +16,7 @@ services:
       - 3307:3389/udp
     volumes:
       - ../../data/win7:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m
 
   win7e:
@@ -36,5 +36,5 @@ services:
       - 3371:3389/udp
     volumes:
       - ../../data/win7e:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m

compose/desktop/win8.yml

@@ -16,7 +16,7 @@ services:
       - 3308:3389/udp
     volumes:
       - ../../data/win81:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m
 
   win81e:
@@ -36,5 +36,5 @@ services:
       - 3381:3389/udp
     volumes:
       - ../../data/win81e:/storage
-    restart: unless-stopped
+    restart: ${RESTART_POLICY:-on-failure}
     stop_grace_period: 2m