fix: goimports — strip unused imports from all server files

internal/server/providers_admin.go

@@ -1,17 +1,17 @@
 package server
 
 import (
+	"database/sql"
 	"fmt"
 	"net/http"
 	"strings"
 	"time"
 
-	"log/slog"
-
-	"github.com/gin-gonic/gin"
 	"gophergate/internal/db"
 	"gophergate/internal/models"
 	"gophergate/internal/utils"
+
+	"github.com/gin-gonic/gin"
 )
 
 func (s *Server) handleGetProviders(c *gin.Context) {
@@ -240,4 +240,3 @@ func (s *Server) handleTestProvider(c *gin.Context) {
 		"latency": latency,
 	}))
 }
-