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/play_profile_repo.go

@@ -0,0 +1,63 @@
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"gorm.io/gorm"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+)
+
+// PlayProfileRepository persists model.PlayProfile records.
+type PlayProfileRepository struct{ db *gorm.DB }
+
+// Create inserts a new play profile.
+func (r *PlayProfileRepository) Create(ctx context.Context, p *model.PlayProfile) error {
+	return r.db.WithContext(ctx).Create(p).Error
+}
+
+// FindByID returns the profile or (nil, nil).
+func (r *PlayProfileRepository) FindByID(ctx context.Context, id string) (*model.PlayProfile, error) {
+	var p model.PlayProfile
+	err := r.db.WithContext(ctx).Where("id = ?", id).First(&p).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &p, nil
+}
+
+// List returns every profile (admin view).
+func (r *PlayProfileRepository) List(ctx context.Context) ([]model.PlayProfile, error) {
+	var rows []model.PlayProfile
+	err := r.db.WithContext(ctx).Order("created_at desc").Find(&rows).Error
+	return rows, err
+}
+
+// ListByUser returns profiles owned by a user.
+func (r *PlayProfileRepository) ListByUser(ctx context.Context, userID string) ([]model.PlayProfile, error) {
+	var rows []model.PlayProfile
+	err := r.db.WithContext(ctx).Where("user_id = ?", userID).
+		Order("created_at desc").Find(&rows).Error
+	return rows, err
+}
+
+// Update applies a partial update to a profile row.
+func (r *PlayProfileRepository) Update(ctx context.Context, id string, patch map[string]any) error {
+	return r.db.WithContext(ctx).Model(&model.PlayProfile{}).
+		Where("id = ?", id).Updates(patch).Error
+}
+
+// Delete soft-deletes a profile.
+func (r *PlayProfileRepository) Delete(ctx context.Context, id string) error {
+	return r.db.WithContext(ctx).Delete(&model.PlayProfile{}, "id = ?", id).Error
+}
+
+// ClearDefaultsFor resets is_default for all of a user's profiles.
+func (r *PlayProfileRepository) ClearDefaultsFor(ctx context.Context, userID string) error {
+	return r.db.WithContext(ctx).Model(&model.PlayProfile{}).
+		Where("user_id = ?", userID).Update("is_default", false).Error
+}