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/customer.py

@@ -1,6 +1,6 @@
 from fastapi import APIRouter, Depends, HTTPException, Query, UploadFile, File, Response
 from sqlalchemy.ext.asyncio import AsyncSession
-from typing import Annotated, Optional, List
+from typing import Optional, List
 from app.database import get_db
 from app.services.customer import CustomerService
 from app.services.customer_health import CustomerHealthService
@@ -18,7 +18,7 @@ async def list_customers(
     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 = CustomerService(db)
     return await service.list_customers(user_id, status, page, size)
@@ -28,7 +28,7 @@ async def list_customers(
 async def get_silent(
     days: int = Query(3, ge=1),
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerService(db)
     customers = await service.get_silent_customers(user_id, days)
@@ -43,7 +43,7 @@ async def get_silent(
 async def get_customer(
     customer_id: str,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerService(db)
     customer = await service.get_customer(user_id, customer_id)
@@ -56,7 +56,7 @@ async def get_customer(
 async def create_customer(
     data: dict,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerService(db)
     customer = await service.create_customer(user_id, data)
@@ -68,7 +68,7 @@ async def update_customer(
     customer_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 = CustomerService(db)
     customer = await service.update_customer(user_id, customer_id, data)
@@ -81,7 +81,7 @@ async def update_customer(
 async def delete_customer(
     customer_id: str,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerService(db)
     deleted = await service.delete_customer(user_id, customer_id)
@@ -94,7 +94,7 @@ async def delete_customer(
 async def import_customers(
     file: UploadFile = File(...),
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     from app.workers.tasks import process_customer_import
 
@@ -135,7 +135,7 @@ async def import_customers(
 async def export_customers(
     status: Optional[str] = None,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerService(db)
     result = await service.list_customers(user_id, status, 1, 9999)
@@ -151,7 +151,7 @@ async def export_customers(
 @router.get("/health-overview")
 async def get_health_overview(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerHealthService(db)
     return await service.get_health_overview(user_id)
@@ -160,7 +160,7 @@ async def get_health_overview(
 @router.get("/health-scores")
 async def get_all_health_scores(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerHealthService(db)
     return {"items": await service.get_all_health_scores(user_id)}
@@ -170,7 +170,7 @@ async def get_all_health_scores(
 async def get_customer_health(
     customer_id: str,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerHealthService(db)
     health = await service.get_customer_health(user_id, customer_id)
@@ -185,7 +185,7 @@ async def get_conversation(
     page: int = Query(1, ge=1),
     size: int = Query(50, ge=1, le=200),
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = CustomerService(db)
     return await service.get_conversation(user_id, customer_id, page, size)