chore: remove license code, fix compilation, update README bilingual

- Remove all license-related code (handler/service/repository/model)
  License authorization is managed by separate server:
  https://github.com/ShukeBta/MediaStationLicenseServer
- Fix compilation errors: model field alignment, method name fixes,
  route conflicts, struct literal corrections (7 files)
- Add Chinese README.md as primary, English README_EN.md
- Update .gitignore: exclude .workbuddy/, editor backups
- Add new repository files: assistant, play_profile, storage_config

internal/repository/storage_config_repo.go

@@ -0,0 +1,39 @@
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"gorm.io/gorm"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+)
+
+// StorageConfigRepository persists model.StorageConfig records.
+type StorageConfigRepository struct{ db *gorm.DB }
+
+// Get returns the config row by type, or (nil, nil).
+func (r *StorageConfigRepository) Get(ctx context.Context, kind string) (*model.StorageConfig, error) {
+	var c model.StorageConfig
+	err := r.db.WithContext(ctx).Where("type = ?", kind).First(&c).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &c, nil
+}
+
+// List returns all storage configs.
+func (r *StorageConfigRepository) List(ctx context.Context) ([]model.StorageConfig, error) {
+	var rows []model.StorageConfig
+	err := r.db.WithContext(ctx).Order("type asc").Find(&rows).Error
+	return rows, err
+}
+
+// Upsert creates or replaces a storage config keyed by Type.
+func (r *StorageConfigRepository) Upsert(ctx context.Context, c *model.StorageConfig) error {
+	return r.db.WithContext(ctx).Where("type = ?", c.Type).
+		Assign(*c).FirstOrCreate(c).Error
+}