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>

go.mod

@@ -1,4 +1,4 @@
-module github.com/mchus/quoteforge
+module git.mchus.pro/mchus/quoteforge
 
 go 1.24.0
 
@@ -6,7 +6,6 @@ require (
 	github.com/gin-gonic/gin v1.9.1
 	github.com/golang-jwt/jwt/v5 v5.3.0
 	github.com/google/uuid v1.6.0
-	github.com/xuri/excelize/v2 v2.10.0
 	golang.org/x/crypto v0.43.0
 	gopkg.in/yaml.v3 v3.0.1
 	gorm.io/driver/mysql v1.5.2
@@ -32,13 +31,9 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
-	github.com/richardlehane/mscfb v1.0.4 // indirect
-	github.com/richardlehane/msoleps v1.0.4 // indirect
-	github.com/tiendc/go-deepcopy v1.7.1 // indirect
+	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.11 // indirect
-	github.com/xuri/efp v0.0.1 // indirect
-	github.com/xuri/nfp v0.0.2-0.20250530014748-2ddeb826f9a9 // indirect
 	golang.org/x/arch v0.3.0 // indirect
 	golang.org/x/net v0.46.0 // indirect
 	golang.org/x/sys v0.37.0 // indirect