chore: initialize fullstack starter and team guidelines

backend/app/api/routes/chat.py

@@ -0,0 +1,7 @@
+from fastapi import APIRouter
+from app.schemas.chat import ChatRequest, ChatResponse
+router = APIRouter(tags=["chat"])
+@router.post("/chat", response_model=ChatResponse)
+def chat(payload: ChatRequest) -> ChatResponse:
+    # TODO: retrieval -> context assembly -> LLM -> evidence/source checks
+    return ChatResponse(answer=f"已收到问题：{payload.question}。当前为基础壳子，尚未接入知识检索或大语言模型。", status="stub", sources=[])

backend/app/api/routes/health.py

@@ -0,0 +1,5 @@
+from fastapi import APIRouter
+router = APIRouter(tags=["health"])
+@router.get("/health")
+def health():
+    return {"status": "ok", "service": "nalati-rag-api"}

backend/app/api/routes/knowledge.py

@@ -0,0 +1,15 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+from app.db.session import get_db
+from app.models.knowledge import KnowledgeItem
+from app.schemas.knowledge import KnowledgeCreate, KnowledgeRead
+router = APIRouter(tags=["knowledge"])
+@router.get("/knowledge", response_model=list[KnowledgeRead])
+def list_knowledge(db: Session = Depends(get_db)):
+    return list(db.scalars(select(KnowledgeItem).order_by(KnowledgeItem.id.desc())).all())
+@router.post("/knowledge", response_model=KnowledgeRead, status_code=201)
+def create_knowledge(payload: KnowledgeCreate, db: Session = Depends(get_db)):
+    item = KnowledgeItem(title=payload.title, category=payload.category, content=payload.content, source_url=str(payload.source_url) if payload.source_url else None, verification_status="pending")
+    db.add(item); db.commit(); db.refresh(item)
+    return item