feat: Add winctl.sh management script and multi-version setup

Add winctl.sh with 12 commands for managing Windows Docker containers:
- start, stop, restart, status, logs, shell, stats
- build, rebuild, list, inspect, monitor, check
- Interactive menus, prerequisites checking, color output
- Support for 22 Windows versions across 4 categories

Multi-version compose structure:
- Split base.yml into base-modern.yml (8G) and base-legacy.yml (2G)
- Add .env.example for configuration
- Update all compose files to use env_file
- Add unique port mappings per version
- Update README with winctl.sh documentation

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

.env.example

@@ -0,0 +1,40 @@
+# Windows Docker VM Configuration
+# Copy this file to .env and customize
+
+# ===========================================
+# MODERN SYSTEMS (Windows 10/11, Server 2016+)
+# ===========================================
+MODERN_RAM_SIZE=8G
+MODERN_CPU_CORES=4
+MODERN_DISK_SIZE=128G
+
+# ===========================================
+# LEGACY SYSTEMS (Windows 7/8, Vista, XP, 2000, Server 2003-2012)
+# ===========================================
+LEGACY_RAM_SIZE=2G
+LEGACY_CPU_CORES=2
+LEGACY_DISK_SIZE=32G
+
+# ===========================================
+# COMMON SETTINGS (applies to all)
+# ===========================================
+
+# User Credentials
+USERNAME=Docker
+PASSWORD=admin
+
+# Language & Region
+LANGUAGE=en
+REGION=en-US
+KEYBOARD=en-US
+
+# Display
+WIDTH=1280
+HEIGHT=720
+
+# Network
+DHCP=N
+SAMBA=Y
+
+# Debug
+DEBUG=N