fix: ensure upload directories can be created at runtime

- Removed fatal directory creation from config.Load to allow server start even if volumes not prepped\n- Kept runtime directory creation in uploadSkin/uploadCape to create skin subdirectories on first upload\n- Confirmed docker-compose.yml includes cdn_skins volume for persistence\n\nCo-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/config/config.go

@@ -4,7 +4,6 @@ package config
 import (
 	"fmt"
 	"os"
-	"path/filepath"
 	"strconv"
 )
 
@@ -52,14 +51,6 @@ func Load() (*Config, error) {
 		return nil, fmt.Errorf("JWT_SECRET is required")
 	}
 
-	// Create storage directories if they don't exist.
-	if err := os.MkdirAll(cfg.CASDir, 0o755); err != nil {
-		return nil, fmt.Errorf("failed to create CAS directory: %w", err)
-	}
-	if err := os.MkdirAll(filepath.Join(cfg.SkinsDir, "aa"), 0o755); err != nil { // Create with subdirectory structure
-		return nil, fmt.Errorf("failed to create skins directory: %w", err)
-	}
-
 	return cfg, nil
 }