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/analytics.py

@@ -1,6 +1,5 @@
 from fastapi import APIRouter, Depends
 from sqlalchemy.ext.asyncio import AsyncSession
-from typing import Annotated
 from app.database import get_db
 from app.services.analytics import AnalyticsService
 from app.api.v1.deps import get_current_user_id
@@ -11,7 +10,7 @@ router = APIRouter()
 @router.get("/customers")
 async def customer_analytics(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = AnalyticsService(db)
     return await service.get_customer_stats(user_id)
@@ -20,7 +19,7 @@ async def customer_analytics(
 @router.get("/translations")
 async def translation_analytics(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = AnalyticsService(db)
     return await service.get_translation_stats(user_id)
@@ -29,7 +28,7 @@ async def translation_analytics(
 @router.get("/quotations")
 async def quotation_analytics(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = AnalyticsService(db)
     return await service.get_quotation_stats(user_id)
@@ -38,7 +37,7 @@ async def quotation_analytics(
 @router.get("/messages")
 async def message_analytics(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = AnalyticsService(db)
     return await service.get_message_stats(user_id)
@@ -47,7 +46,7 @@ async def message_analytics(
 @router.get("/overview")
 async def overview(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = AnalyticsService(db)
     customers = await service.get_customer_stats(user_id)
@@ -67,7 +66,7 @@ async def overview(
 @router.get("/marketing")
 async def marketing_analytics(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = AnalyticsService(db)
     return await service.get_marketing_stats(user_id)