🚀 MAJOR: Full migration to Just modules with modern features

BREAKING CHANGES:
- Complete restructure to Just module architecture (requires Just 1.31.0+)
- Command syntax changed: 'just postgres-sql' → 'just postgres sql'
- Import syntax changed: import → mod declarations

NEW FEATURES:
✨ Module-based architecture with optional modules
✨ Built-in Just colors ({{RED}}, {{GREEN}}, etc.) replace custom variables
✨ Enhanced [confirm] attributes for all destructive operations
✨ Organized [group('name')] attributes for better UX
✨ Modern justfile with comprehensive help system
✨ Updated documentation with migration guide

MODULES:
📦 postgres/    - PostgreSQL operations (sql, check, create-database, etc.)
📦 mysql/       - MySQL operations (sql, check, create-user, etc.)
📦 volumes/     - Volume management (clean-all, remove, list)
📦 container/   - Container operations (start, stop, logs, shell, exec)
📦 registry/    - Registry auth (login, logout, check)
📦 images/      - Image operations (build, push, pull, tag, clean)

USAGE:
just postgres sql "SELECT version();"
just volumes clean-all
just images build myapp

This is Just Commons v2.0 - a complete modernization using all of Just's latest features.

volumes/mod.just

@@ -0,0 +1,121 @@
+# Universal volume management operations
+
+# Clean all volumes used by compose file (DESTRUCTIVE!)
+[group('volumes')]
+[confirm]
+clean-all compose-file="":
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    compose_file="{{compose-file}}"
+    compose_cmd=$(just _detect_compose)
+
+    # Build compose file argument
+    file_arg=""
+    if [ -n "$compose_file" ]; then
+        file_arg="-f $compose_file"
+    fi
+
+    echo -e "{{RED}}⚠️  WARNING: This will DELETE ALL DATA!{{NORMAL}}"
+    echo -e "{{YELLOW}}This will remove all volumes defined in the compose file{{NORMAL}}"
+
+    # Show which volumes would be removed
+    echo -e "{{BLUE}}Volumes that will be removed:{{NORMAL}}"
+    $compose_cmd $file_arg config --volumes 2>/dev/null || echo "Cannot list volumes from compose file"
+    echo ""
+
+    echo -e "{{BLUE}}Stopping services...{{NORMAL}}"
+    $compose_cmd $file_arg down
+
+    echo -e "{{BLUE}}Removing volumes...{{NORMAL}}"
+    $compose_cmd $file_arg down -v
+
+    echo -e "{{GREEN}}✓ All volumes removed{{NORMAL}}"
+
+# Remove specific volume by name (DESTRUCTIVE!)
+[group('volumes')]
+[confirm]
+remove volume_name:
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    volume_name="{{volume_name}}"
+
+    if [ -z "$volume_name" ]; then
+        echo "{{BOLD}}{{RED}}Error:{{NORMAL}} Volume name is required" >&2
+        echo "{{YELLOW}}Usage:{{NORMAL}} just volumes remove my_volume_name" >&2
+        exit 1
+    fi
+
+    runtime=$(just _detect_runtime)
+
+    # Check if volume exists
+    if ! $runtime volume ls --format "table {{{{.Name}}}}" | grep -q "^${volume_name}$"; then
+        echo -e "{{YELLOW}}Volume '$volume_name' does not exist{{NORMAL}}"
+        exit 0
+    fi
+
+    echo -e "{{RED}}⚠️  WARNING: This will DELETE VOLUME DATA!{{NORMAL}}"
+    echo -e "{{YELLOW}}This will remove volume: $volume_name{{NORMAL}}"
+
+    echo -e "{{BLUE}}Removing volume: $volume_name{{NORMAL}}"
+    $runtime volume rm "$volume_name" 2>/dev/null || true
+
+    echo -e "{{GREEN}}✓ Volume '$volume_name' removed{{NORMAL}}"
+
+# Remove volumes matching pattern (DESTRUCTIVE!)
+[group('volumes')]
+[confirm]
+remove-pattern pattern:
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    pattern="{{pattern}}"
+
+    if [ -z "$pattern" ]; then
+        echo "{{BOLD}}{{RED}}Error:{{NORMAL}} Volume pattern is required" >&2
+        echo "{{YELLOW}}Usage:{{NORMAL}} just volumes remove-pattern 'myproject_*'" >&2
+        exit 1
+    fi
+
+    runtime=$(just _detect_runtime)
+
+    # Find matching volumes
+    matching_volumes=$($runtime volume ls --format "table {{{{.Name}}}}" | grep "$pattern" || true)
+
+    if [ -z "$matching_volumes" ]; then
+        echo -e "{{YELLOW}}No volumes found matching pattern: $pattern{{NORMAL}}"
+        exit 0
+    fi
+
+    echo -e "{{RED}}⚠️  WARNING: This will DELETE VOLUME DATA!{{NORMAL}}"
+    echo -e "{{YELLOW}}Volumes matching pattern '$pattern':{{NORMAL}}"
+    echo "$matching_volumes"
+    echo ""
+
+    echo -e "{{BLUE}}Removing matching volumes...{{NORMAL}}"
+    echo "$matching_volumes" | while IFS= read -r volume; do
+        if [ -n "$volume" ]; then
+            echo "Removing: $volume"
+            $runtime volume rm "$volume" 2>/dev/null || true
+        fi
+    done
+
+    echo -e "{{GREEN}}✓ Matching volumes removed{{NORMAL}}"
+
+# List all volumes or filter by pattern
+[group('volumes')]
+list pattern="":
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    pattern="{{pattern}}"
+    runtime=$(just _detect_runtime)
+
+    if [ -n "$pattern" ]; then
+        echo -e "{{BLUE}}Volumes matching pattern '$pattern':{{NORMAL}}"
+        $runtime volume ls | grep "$pattern" || echo "No volumes found matching pattern: $pattern"
+    else
+        echo -e "{{BLUE}}All volumes:{{NORMAL}}"
+        $runtime volume ls
+    fi