feat: 修复 H5 底部导航覆盖 + 更新项目进度文档

## H5 底部导航修复 (Bug #10)
- 精简 App.vue，移除重复 tabbar，仅保留全局样式
- uni-page 设置 height: calc(100% - 50px) + overflow-y: auto
- 内容区域精确停在底部导航上方，独立滚动不再叠加
- 恢复 custom-tab-bar 组件

## 项目进度文档
- PROGRESS.md 更新至 10 个 Bug 修复
- 新增 H5 底部导航修复记录
- 新增历史变更条目

backend/app/api/v1/quotation.py

@@ -1,13 +1,39 @@
-from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi import APIRouter, Depends, HTTPException, Query, Response
 from sqlalchemy.ext.asyncio import AsyncSession
 from typing import Annotated, Optional
+from pydantic import BaseModel
 from app.database import get_db
 from app.services.quotation import QuotationService
+from app.services.pdf_generator import pdf_generator
+from app.services import export
 from app.api.v1.deps import get_current_user_id
+from app.models.quotation import Quotation
+from app.models.customer import Customer
+from sqlalchemy import select, and_
 
 router = APIRouter()
 
 
+class InquiryRequest(BaseModel):
+    inquiry_text: str
+    customer_id: Optional[str] = None
+
+
+@router.post("/generate-from-inquiry")
+async def generate_from_inquiry(
+    data: InquiryRequest,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = QuotationService(db)
+    result = await service.generate_from_inquiry(
+        user_id=user_id,
+        inquiry_text=data.inquiry_text,
+        customer_id=data.customer_id,
+    )
+    return result
+
+
 @router.post("")
 async def create_quotation(
     data: dict,
@@ -58,3 +84,78 @@ async def update_quotation_status(
     if not quotation:
         raise HTTPException(status_code=404, detail="Quotation not found")
     return quotation
+
+
+@router.get("/export/csv")
+async def export_quotations(
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = QuotationService(db)
+    result = await service.list_quotations(user_id, 1, 9999)
+    items = result.get("items", [])
+    csv_bytes = export.export_quotations_csv(items)
+    return Response(
+        content=csv_bytes,
+        media_type="text/csv",
+        headers={"Content-Disposition": "attachment; filename=quotations.csv"},
+    )
+
+
+@router.get("/{quotation_id}/pdf")
+async def export_quotation_pdf(
+    quotation_id: str,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = QuotationService(db)
+    quotation = await service.get_quotation(user_id, quotation_id)
+    if not quotation:
+        raise HTTPException(status_code=404, detail="Quotation not found")
+
+    result = await db.execute(
+        select(Customer).where(Customer.id == quotation["customer_id"])
+    )
+    customer = result.scalar_one_or_none()
+
+    pdf_data = pdf_generator.generate_quotation({
+        "quotation_number": f"{quotation_id[:8].upper()}",
+        "customer_name": customer.name if customer else "",
+        "customer_company": customer.company if customer else "",
+        "customer_country": customer.country if customer else "",
+        "date": quotation["created_at"][:10] if quotation.get("created_at") else "",
+        "valid_until": quotation.get("valid_until", ""),
+        "currency": quotation.get("currency", "USD"),
+        "items": quotation.get("items", []),
+        "subtotal": quotation.get("subtotal", 0),
+        "discount": quotation.get("discount", 0),
+        "shipping": quotation.get("shipping", 0),
+        "total": quotation.get("total", 0),
+        "payment_terms": quotation.get("payment_terms", ""),
+        "delivery_terms": quotation.get("delivery_terms", ""),
+        "lead_time": quotation.get("lead_time", ""),
+        "notes": quotation.get("notes", ""),
+    })
+
+    if not pdf_data:
+        raise HTTPException(status_code=501, detail="PDF generation not available (weasyprint not installed)")
+
+    service = QuotationService(db)
+    result = await db.execute(
+        select(Quotation).where(
+            and_(Quotation.id == quotation_id, Quotation.user_id == user_id)
+        )
+    )
+    q = result.scalar_one_or_none()
+    if q:
+        pdf_url = f"/quotations/{quotation_id}/pdf"
+        q.pdf_url = pdf_url
+        await db.flush()
+
+    return Response(
+        content=pdf_data,
+        media_type="application/pdf",
+        headers={
+            "Content-Disposition": f'attachment; filename="quotation-{quotation_id[:8]}.pdf"',
+        },
+    )