refactor: unify code formatting and improve push/search implementations

- Remove BOM from all Go source files
- Standardize import ordering and whitespace across handlers and services
- Replace PostgreSQL full-text search with ILIKE pattern matching in post and user repositories
- Enhance JPush client with TLS transport, rate limit monitoring, and simplified API
- Refactor PushService to include userID in device management methods
- Add MaxDevicesPerUser limit and extract helper functions for push payload construction

internal/handler/channel_handler.go

@@ -1,4 +1,4 @@
-package handler
+package handler
 
 import (
 	"with_you/internal/model"
@@ -120,4 +120,3 @@ func (h *ChannelHandler) AdminDelete(c *gin.Context) {
 	}
 	response.Success(c, gin.H{"success": true})
 }
-