Redesign configurator UI with tabs and remove Excel export

- Add tab-based configurator (Base, Storage, PCI, Power, Accessories, Other)
- Base tab: single-select with autocomplete for MB, CPU, MEM
- Other tabs: multi-select with autocomplete and quantity input
- Table view with LOT, Description, Price, Quantity, Total columns
- Add configuration list page with create modal (opportunity number)
- Remove Excel export functionality and excelize dependency
- Increase component list limit from 100 to 5000
- Add web templates (base, index, configs, login, admin_pricing)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/server/main.go

@@ -11,14 +11,15 @@ import (
 	"time"
 
 	"github.com/gin-gonic/gin"
-	"github.com/mchus/quoteforge/internal/config"
-	"github.com/mchus/quoteforge/internal/handlers"
-	"github.com/mchus/quoteforge/internal/middleware"
-	"github.com/mchus/quoteforge/internal/models"
-	"github.com/mchus/quoteforge/internal/repository"
-	"github.com/mchus/quoteforge/internal/services"
-	"github.com/mchus/quoteforge/internal/services/alerts"
-	"github.com/mchus/quoteforge/internal/services/pricing"
+	"git.mchus.pro/mchus/quoteforge/internal/config"
+	"git.mchus.pro/mchus/quoteforge/internal/handlers"
+	"git.mchus.pro/mchus/quoteforge/internal/middleware"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"git.mchus.pro/mchus/quoteforge/internal/repository"
+	"git.mchus.pro/mchus/quoteforge/internal/services"
+	"git.mchus.pro/mchus/quoteforge/internal/services/alerts"
+	"git.mchus.pro/mchus/quoteforge/internal/services/pricing"
+	"golang.org/x/crypto/bcrypt"
 	"gorm.io/driver/mysql"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
@@ -59,11 +60,21 @@ func main() {
 			slog.Error("seeding categories failed", "error", err)
 			os.Exit(1)
 		}
+		// Create default admin user (admin / admin123)
+		adminHash, _ := bcrypt.GenerateFromPassword([]byte("admin123"), bcrypt.DefaultCost)
+		if err := models.SeedAdminUser(db, string(adminHash)); err != nil {
+			slog.Error("seeding admin user failed", "error", err)
+			os.Exit(1)
+		}
 		slog.Info("migrations completed")
 	}
 
 	gin.SetMode(cfg.Server.Mode)
-	router := setupRouter(db, cfg)
+	router, err := setupRouter(db, cfg)
+	if err != nil {
+		slog.Error("failed to setup router", "error", err)
+		os.Exit(1)
+	}
 
 	srv := &http.Server{
 		Addr:         cfg.Address(),
@@ -143,7 +154,7 @@ func setupDatabase(cfg config.DatabaseConfig) (*gorm.DB, error) {
 	return db, nil
 }
 
-func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
+func setupRouter(db *gorm.DB, cfg *config.Config) (*gin.Engine, error) {
 	// Repositories
 	userRepo := repository.NewUserRepository(db)
 	componentRepo := repository.NewComponentRepository(db)
@@ -168,7 +179,13 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 	quoteHandler := handlers.NewQuoteHandler(quoteService)
 	configHandler := handlers.NewConfigurationHandler(configService, exportService)
 	exportHandler := handlers.NewExportHandler(exportService, configService, componentService)
-	pricingHandler := handlers.NewPricingHandler(pricingService, alertService, componentRepo, statsRepo)
+	pricingHandler := handlers.NewPricingHandler(db, pricingService, alertService, componentRepo, priceRepo, statsRepo)
+
+	// Web handler (templates)
+	webHandler, err := handlers.NewWebHandler("web/templates", componentService)
+	if err != nil {
+		return nil, err
+	}
 
 	// Router
 	router := gin.New()
@@ -176,6 +193,9 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 	router.Use(requestLogger())
 	router.Use(middleware.CORS())
 
+	// Static files
+	router.Static("/static", "web/static")
+
 	// Health check
 	router.GET("/health", func(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{
@@ -184,6 +204,47 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 		})
 	})
 
+	// DB status endpoint
+	router.GET("/api/db-status", func(c *gin.Context) {
+		var lotCount, lotLogCount, metadataCount int64
+		var dbOK bool = true
+		var dbError string
+
+		sqlDB, err := db.DB()
+		if err != nil {
+			dbOK = false
+			dbError = err.Error()
+		} else if err := sqlDB.Ping(); err != nil {
+			dbOK = false
+			dbError = err.Error()
+		}
+
+		db.Table("lot").Count(&lotCount)
+		db.Table("lot_log").Count(&lotLogCount)
+		db.Table("qt_lot_metadata").Count(&metadataCount)
+
+		c.JSON(http.StatusOK, gin.H{
+			"connected":      dbOK,
+			"error":          dbError,
+			"lot_count":      lotCount,
+			"lot_log_count":  lotLogCount,
+			"metadata_count": metadataCount,
+		})
+	})
+
+	// Web pages
+	router.GET("/", webHandler.Index)
+	router.GET("/login", webHandler.Login)
+	router.GET("/configs", webHandler.Configs)
+	router.GET("/configurator", webHandler.Configurator)
+	router.GET("/admin/pricing", webHandler.AdminPricing)
+
+	// htmx partials
+	partials := router.Group("/partials")
+	{
+		partials.GET("/components", webHandler.ComponentsPartial)
+	}
+
 	// API routes
 	api := router.Group("/api")
 	{
@@ -209,7 +270,6 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 
 		// Categories (public)
 		api.GET("/categories", componentHandler.GetCategories)
-		api.GET("/vendors", componentHandler.GetVendors)
 
 		// Quote (public, for anonymous quote building)
 		quote := api.Group("/quote")
@@ -222,7 +282,6 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 		export := api.Group("/export")
 		{
 			export.POST("/csv", exportHandler.ExportCSV)
-			export.POST("/xlsx", exportHandler.ExportXLSX)
 		}
 
 		// Configurations (requires auth)
@@ -237,7 +296,6 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 			configs.DELETE("/:uuid", configHandler.Delete)
 			configs.GET("/:uuid/export", configHandler.ExportJSON)
 			configs.GET("/:uuid/csv", exportHandler.ExportConfigCSV)
-			configs.GET("/:uuid/xlsx", exportHandler.ExportConfigXLSX)
 			configs.POST("/import", configHandler.ImportJSON)
 		}
 	}
@@ -254,6 +312,7 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 			pricingAdmin.GET("/components", pricingHandler.ListComponents)
 			pricingAdmin.GET("/components/:lot_name", pricingHandler.GetComponentPricing)
 			pricingAdmin.POST("/update", pricingHandler.UpdatePrice)
+			pricingAdmin.POST("/preview", pricingHandler.PreviewPrice)
 			pricingAdmin.POST("/recalculate-all", pricingHandler.RecalculateAll)
 
 			pricingAdmin.GET("/alerts", pricingHandler.ListAlerts)
@@ -263,7 +322,7 @@ func setupRouter(db *gorm.DB, cfg *config.Config) *gin.Engine {
 		}
 	}
 
-	return router
+	return router, nil
 }
 
 func requestLogger() gin.HandlerFunc {