Fix API errors and improve customer discovery with real web results

- Fix usage/stats 500: use Date() not datetime.date() for SQL cast
- Fix customers 422: raise size limit to 1000
- Replace unreliable MCP client with direct Bing batch search for discovery
- Batch all search queries in one browser session (faster)
- Show real company names/URLs from Bing, not generic templates
- Smart filter for non-business results (news, blogs, forums)
- Fallback suggestions when search results are insufficient
- Frontend: clickable contact URLs, provider indicator, better layout

backend/app/services/usage.py

@@ -2,6 +2,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select, func
 from fastapi import HTTPException, Depends
 from datetime import datetime, date
+from sqlalchemy import Date
 import logging
 
 from app.models import UsageLog, SystemConfig, User, Customer, Product
@@ -52,7 +53,7 @@ class UsageService:
         stmt = select(func.count()).where(
             UsageLog.user_id == user_id,
             UsageLog.action == action,
-            func.cast(UsageLog.created_at, date) == today,
+            func.cast(UsageLog.created_at, Date) == today,
         )
         result = await self.db.execute(stmt)
         return result.scalar() or 0
@@ -64,7 +65,7 @@ class UsageService:
         ), 0)).where(
             UsageLog.user_id == user_id,
             UsageLog.action == "translate",
-            func.cast(UsageLog.created_at, date) == today,
+            func.cast(UsageLog.created_at, Date) == today,
         )
         result = await self.db.execute(stmt)
         return result.scalar() or 0