fix: 全面修复6项问题——Auto模型路由/媒体提示词优化/微信Bot/Token驾驶舱/技能市场清空

1. resolve_auto_model: image/video/audio无显式默认时自动发现启用模型(原返回None→文本模型回退→AI说无法生成)
2. 新增_optimize_media_prompt: 调用文本LLM精炼用户原始输入为AGNES高质量提示词(去除对话噪音+英文优化)
3. detect_media_intent: 扩展关键词覆盖多轮对话模式(做图片/生成个图/画一下/制作视频等)
4. chat.py+im_llm.py: 所有httpx调用补trust_env=False+_proxy_for_url, 规避容器坏代理
5. token_usage.py: 模型名回退链(model表→日志自带的model_name→auto标签), 不再显示unknown
6. skills_admin.py: 新增POST /batch-delete批量删除API(ids空则删全部)
7. 技能市场数据已清空, 用户可重新导入技能

backend/python/app/api/admin/skills_admin.py

@@ -16,7 +16,8 @@ from sqlalchemy import desc, func, or_, and_
 from ...database import get_db
 from ...models import (
     User, EvolutionSkill, SkillVersion, SkillPublishRecord,
-    EvolutionEvent, TeamSharedSkill
+    EvolutionEvent, TeamSharedSkill, MarketApp, AppInstallation,
+    AppPurchase, AppReview
 )
 from ...auth import get_current_admin
 from ...middleware.log_service import LogService
@@ -429,7 +430,55 @@ async def update_skill(
 
 
 # ============================================================
-# 删除技能
+# 批量删除技能（用于一次性清空技能市场）
+# ============================================================
+
+
+class BatchDeleteSkillsRequest(BaseModel):
+    ids: list[str] = []  # 要删除的技能 ID 列表；传空列表则删除所有
+
+
+@router.post("/batch-delete")
+async def batch_delete_skills(
+    req: BatchDeleteSkillsRequest,
+    admin_user=Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    """批量删除技能。ids 为空则删除全部技能。"""
+    if req.ids:
+        skills = db.query(EvolutionSkill).filter(EvolutionSkill.id.in_(req.ids)).all()
+    else:
+        skills = db.query(EvolutionSkill).all()
+
+    deleted_count = 0
+    for skill in skills:
+        skill_name = skill.skill_name
+        # 删除版本历史
+        db.query(SkillVersion).filter(SkillVersion.skill_name == skill_name).delete()
+        # 删除发布记录
+        db.query(SkillPublishRecord).filter(SkillPublishRecord.skill_id == skill.id).delete()
+        # 删除团队共享
+        db.query(TeamSharedSkill).filter(TeamSharedSkill.skill_id == skill.id).delete()
+        # 同步清理市场应用表中的技能
+        market_app = db.query(MarketApp).filter(
+            MarketApp.type == "skill",
+            MarketApp.name == skill_name,
+        ).first()
+        if market_app:
+            # 清理关联的安装和购买记录
+            db.query(AppInstallation).filter(AppInstallation.app_id == market_app.id).delete()
+            db.query(AppPurchase).filter(AppPurchase.app_id == market_app.id).delete()
+            db.query(AppReview).filter(AppReview.app_id == market_app.id).delete()
+            db.delete(market_app)
+        db.delete(skill)
+        deleted_count += 1
+
+    db.commit()
+    return {"code": 0, "data": {"deleted": deleted_count}, "message": f"已删除 {deleted_count} 个技能"}
+
+
+# ============================================================
+# 删除技能（单个）
 # ============================================================
 
 @router.delete("/{skill_id}")