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/interaction.py

@@ -1,6 +1,5 @@
 from fastapi import APIRouter, Depends, HTTPException
 from sqlalchemy.ext.asyncio import AsyncSession
-from typing import Annotated
 from app.database import get_db
 from app.services.preference import UserPreferenceService
 from app.services.marketing_effect import MarketingEffectService
@@ -13,7 +12,7 @@ router = APIRouter()
 async def record_selection(
     data: dict,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     message_id = data.get("message_id")
     selected_index = data.get("selected_index")
@@ -30,7 +29,7 @@ async def record_selection(
 async def record_edit(
     data: dict,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     message_id = data.get("message_id")
     edited_text = data.get("edited_text")
@@ -46,7 +45,7 @@ async def record_edit(
 @router.post("/analyze")
 async def analyze_preferences(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = UserPreferenceService(db)
     preferences = await service.analyze_preferences(user_id)
@@ -56,7 +55,7 @@ async def analyze_preferences(
 @router.get("/preferences")
 async def get_preferences(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = UserPreferenceService(db)
     return await service.get_analysis(user_id)
@@ -66,7 +65,7 @@ async def get_preferences(
 async def track_marketing_effect(
     data: dict,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = MarketingEffectService(db)
     result = await service.track_event(
@@ -87,7 +86,7 @@ async def get_marketing_effects(
     page: int = 1,
     size: int = 20,
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = MarketingEffectService(db)
     return await service.get_effects(user_id, page, size)
@@ -96,7 +95,7 @@ async def get_marketing_effects(
 @router.get("/marketing-effects/stats")
 async def get_marketing_effect_stats(
     user_id: str = Depends(get_current_user_id),
-    db: Annotated[AsyncSession, Depends(get_db)] = None,
+    db: AsyncSession = Depends(get_db),
 ):
     service = MarketingEffectService(db)
     return await service.get_stats(user_id)