fix:优化项目内容

backend/app/routers/projects.py

@@ -3,7 +3,11 @@ from datetime import datetime, timezone
 from pathlib import Path
 from typing import Any, Dict, List, Union
 
-from fastapi import APIRouter, Depends, HTTPException, status
+import json
+from typing import AsyncGenerator
+
+from fastapi import APIRouter, Depends, HTTPException, Query, status
+from fastapi.responses import StreamingResponse
 from sqlalchemy.orm import Session, joinedload
 
 from backend.app import models
@@ -105,6 +109,7 @@ def _build_markdown_from_analysis(data: Union[Dict[str, Any], List[Any]]) -> str
 @router.get("/", response_model=list[ProjectRead])
 async def list_projects(
     customer_tag: str | None = None,
+    limit: int = Query(30, ge=1, le=200, description="默认只返回最近 N 条"),
     db: Session = Depends(get_db),
 ):
     """列表项目；customer_tag 不为空时只返回该客户标签下的项目（按客户 tags 筛选）。"""
@@ -127,7 +132,7 @@ async def list_projects(
                 t.ilike(f"%,{tag}"),
             )
         )
-    return query.all()
+    return query.limit(limit).all()
 
 
 @router.get("/{project_id}", response_model=ProjectRead)
@@ -200,6 +205,88 @@ async def analyze_project_requirement(
     )
 
 
+@router.post("/analyze_stream")
+async def analyze_project_requirement_stream(
+    payload: RequirementAnalyzeRequest,
+    db: Session = Depends(get_db),
+):
+    """
+    SSE 流式输出 Markdown 到前端（用于编辑器实时显示）。
+    data: {"type":"delta","content":"..."} / {"type":"done","project_id":1}
+    """
+    customer = db.query(models.Customer).get(payload.customer_id)
+    if not customer:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Customer not found")
+
+    # Create a project first so we can return project_id at end
+    project = models.Project(
+        customer_id=payload.customer_id,
+        raw_requirement=payload.raw_text,
+        ai_solution_md="",
+        status="draft",
+    )
+    db.add(project)
+    db.commit()
+    db.refresh(project)
+
+    async def gen() -> AsyncGenerator[str, None]:
+        from backend.app.services.ai_service import get_active_ai_config
+        from openai import AsyncOpenAI
+
+        config = get_active_ai_config()
+        api_key = (config.get("api_key") or "").strip()
+        if not api_key:
+            yield f"data: {json.dumps({'type':'error','message':'AI API Key 未配置'})}\n\n"
+            return
+        base_url = (config.get("base_url") or "").strip() or None
+        client = AsyncOpenAI(api_key=api_key, base_url=base_url)
+        model = config.get("model_name") or "gpt-4o-mini"
+        temperature = float(config.get("temperature", 0.2))
+
+        system_prompt = (
+            (config.get("system_prompt_override") or "").strip()
+            or "你是一名资深系统架构师，请输出可直接编辑的 Markdown 方案，不要输出 JSON。"
+        )
+        user_prompt = (
+            "请基于以下客户原始需求，输出一份可交付的项目方案草稿（Markdown）。\n"
+            "要求包含：概要、功能模块拆分、技术实现思路、工时与报价估算、备注。\n\n"
+            f"【客户原始需求】\n{payload.raw_text}"
+        )
+
+        full = ""
+        try:
+            stream = await client.chat.completions.create(
+                model=model,
+                messages=[
+                    {"role": "system", "content": system_prompt},
+                    {"role": "user", "content": user_prompt},
+                ],
+                temperature=temperature,
+                stream=True,
+            )
+            async for event in stream:
+                delta = (event.choices[0].delta.content or "") if event.choices else ""
+                if not delta:
+                    continue
+                full += delta
+                yield f"data: {json.dumps({'type':'delta','content':delta}, ensure_ascii=False)}\n\n"
+        except Exception as exc:
+            yield f"data: {json.dumps({'type':'error','message':str(exc)}, ensure_ascii=False)}\n\n"
+            return
+
+        # Save final markdown
+        try:
+            project.ai_solution_md = full
+            db.add(project)
+            db.commit()
+        except Exception:
+            pass
+
+        yield f"data: {json.dumps({'type':'done','project_id':project.id}, ensure_ascii=False)}\n\n"
+
+    return StreamingResponse(gen(), media_type="text/event-stream")
+
+
 @router.post("/{project_id}/generate_quote", response_model=QuoteGenerateResponse)
 async def generate_project_quote(
     project_id: int,