feat: AI虚拟用户新闻互动系统 v1.3.0 初始提交

- 虚拟用户管理（昵称/头像/性别/简介/邮箱同步到目标平台）
- AI互动调度（点赞/收藏/评论/转发）
- 日志时间改为北京时间
- 评论达上限后继续执行点赞收藏转发
- 一键登出全部功能
- 浅色主题UI

backend/app/api/endpoints/ai_models.py

@@ -0,0 +1,87 @@
+"""AI模型配置接口"""
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy import select, update
+
+from app.core.database import get_db
+from app.schemas import ApiResponse, AIModelCreateRequest, AIModelUpdateRequest, AIModelTestRequest
+from app.models import AIModelConfig
+from app.utils.crypto import encrypt, decrypt
+from app.services.ai_service import ai_service
+
+router = APIRouter()
+
+
+@router.get("")
+async def list_models(db=Depends(get_db)):
+    result = await db.execute(select(AIModelConfig).order_by(AIModelConfig.created_at.desc()))
+    models = result.scalars().all()
+    items = [_format_model(m) for m in models]
+    return ApiResponse(data=items)
+
+
+@router.post("")
+async def create_model(req: AIModelCreateRequest, db=Depends(get_db)):
+    if req.is_default:
+        await db.execute(update(AIModelConfig).values(is_default=0))
+    model = AIModelConfig(
+        model_name=req.model_name,
+        provider=req.provider,
+        api_base_url=req.api_base_url,
+        api_key_enc=encrypt(req.api_key) if req.api_key else None,
+        model_version=req.model_version,
+        temperature=req.temperature,
+        max_tokens=req.max_tokens,
+        timeout_seconds=req.timeout_seconds,
+        is_default=req.is_default,
+        is_enabled=1,
+    )
+    db.add(model)
+    await db.commit()
+    await db.refresh(model)
+    return ApiResponse(data=_format_model(model), message="模型添加成功")
+
+
+@router.put("/{model_id}")
+async def update_model(model_id: int, req: AIModelUpdateRequest, db=Depends(get_db)):
+    result = await db.execute(select(AIModelConfig).where(AIModelConfig.id == model_id))
+    model = result.scalar_one_or_none()
+    if not model:
+        raise HTTPException(status_code=404, detail="模型不存在")
+    if req.is_default:
+        await db.execute(update(AIModelConfig).where(AIModelConfig.id != model_id).values(is_default=0))
+    for field, val in req.model_dump(exclude_none=True).items():
+        if field == "api_key":
+            model.api_key_enc = encrypt(val) if val else None
+        else:
+            setattr(model, field, val)
+    await db.commit()
+    await db.refresh(model)
+    return ApiResponse(data=_format_model(model), message="更新成功")
+
+
+@router.delete("/{model_id}")
+async def delete_model(model_id: int, db=Depends(get_db)):
+    result = await db.execute(select(AIModelConfig).where(AIModelConfig.id == model_id))
+    model = result.scalar_one_or_none()
+    if not model:
+        raise HTTPException(status_code=404, detail="模型不存在")
+    await db.delete(model)
+    await db.commit()
+    return ApiResponse(message="删除成功")
+
+
+@router.post("/test")
+async def test_model(req: AIModelTestRequest, db=Depends(get_db)):
+    result = await ai_service.test_model(db, req.model_id, req.test_prompt)
+    return ApiResponse(data=result)
+
+
+def _format_model(m: AIModelConfig) -> dict:
+    return {
+        "id": m.id, "model_name": m.model_name, "provider": m.provider,
+        "api_base_url": m.api_base_url, "has_api_key": bool(m.api_key_enc),
+        "model_version": m.model_version, "temperature": m.temperature,
+        "max_tokens": m.max_tokens, "timeout_seconds": m.timeout_seconds,
+        "is_default": m.is_default, "is_enabled": m.is_enabled,
+        "created_at": m.created_at.isoformat(),
+    }