refactor: Use separate .env.modern and .env.legacy files

- Remove base-legacy.yml and base-modern.yml (YAML anchors don't work with include)
- Make all compose files self-contained
- Add .env.modern (8G RAM, 4 CPU) for Win 10/11, Server 2016+
- Add .env.legacy (2G RAM, 2 CPU) for older systems
- Update README and .env.example documentation

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

compose/desktop/win10.yml

@@ -1,42 +1,60 @@
-include:
-  - ../base-modern.yml
-
 services:
   win10:
-    <<: *modern
+    image: dockurr/windows
     container_name: win10
-    env_file: ../../.env
+    env_file: ../../.env.modern
     environment:
       VERSION: "10"
+    devices:
+      - /dev/kvm
+      - /dev/net/tun
+    cap_add:
+      - NET_ADMIN
     ports:
       - 8010:8006
       - 3310:3389/tcp
       - 3310:3389/udp
     volumes:
       - ../../data/win10:/storage
+    restart: unless-stopped
+    stop_grace_period: 2m
 
   win10e:
-    <<: *modern
+    image: dockurr/windows
     container_name: win10e
-    env_file: ../../.env
+    env_file: ../../.env.modern
     environment:
       VERSION: "10e"
+    devices:
+      - /dev/kvm
+      - /dev/net/tun
+    cap_add:
+      - NET_ADMIN
     ports:
       - 8014:8006
       - 3314:3389/tcp
       - 3314:3389/udp
     volumes:
       - ../../data/win10e:/storage
+    restart: unless-stopped
+    stop_grace_period: 2m
 
   win10l:
-    <<: *modern
+    image: dockurr/windows
     container_name: win10l
-    env_file: ../../.env
+    env_file: ../../.env.modern
     environment:
       VERSION: "10l"
+    devices:
+      - /dev/kvm
+      - /dev/net/tun
+    cap_add:
+      - NET_ADMIN
     ports:
       - 8015:8006
       - 3315:3389/tcp
       - 3315:3389/udp
     volumes:
       - ../../data/win10l:/storage
+    restart: unless-stopped
+    stop_grace_period: 2m