feat: silent wechat login, marketing tab optimization, admin page foundation

- Add silent WeChat login for MP/browser environments
- Fix Python 3.6 compatibility (remove typing.Annotated usage)
- Marketing page: tab-based content generation with category support
- Translate page: add auto-detect language default
- Homepage: add TTS playback, announcement ticker, remove redundant quick-actions
- Fix FAB button overlap with custom tabbar on customers/quotation pages
- Make openai/anthropic imports lazy for Python 3.6 compat

backend/app/api/v1/quotation.py

@@ -1,6 +1,6 @@
 from fastapi import APIRouter, Depends, HTTPException, Query, Response
 from sqlalchemy.ext.asyncio import AsyncSession
-from typing import Annotated, Optional
+from typing import Optional
 from pydantic import BaseModel
 from app.database import get_db
 from app.services.quotation import QuotationService
@@ -23,7 +23,7 @@ class InquiryRequest(BaseModel):
 async def generate_from_inquiry(
     data: InquiryRequest,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = QuotationService(db)
     result = await service.generate_from_inquiry(
@@ -38,7 +38,7 @@ async def generate_from_inquiry(
 async def create_quotation(
     data: dict,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = QuotationService(db)
     try:
@@ -53,7 +53,7 @@ async def list_quotations(
     page: int = Query(1, ge=1),
     size: int = Query(20, ge=1, le=100),
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = QuotationService(db)
     return await service.list_quotations(user_id, page, size)
@@ -63,7 +63,7 @@ async def list_quotations(
 async def get_quotation(
     quotation_id: str,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = QuotationService(db)
     quotation = await service.get_quotation(user_id, quotation_id)
@@ -77,7 +77,7 @@ async def update_quotation_status(
     quotation_id: str,
     data: dict,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = QuotationService(db)
     quotation = await service.update_status(user_id, quotation_id, data.get("status", "draft"))
@@ -89,7 +89,7 @@ async def update_quotation_status(
 @router.get("/export/csv")
 async def export_quotations(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = QuotationService(db)
     result = await service.list_quotations(user_id, 1, 9999)
@@ -106,7 +106,7 @@ async def export_quotations(
 async def export_quotation_pdf(
     quotation_id: str,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = QuotationService(db)
     quotation = await service.get_quotation(user_id, quotation_id)