Add admin component (#6928)

* init version

* relocate

* add s3 bucket link

* refactor handlers into weed/admin folder

* fix login logout

* adding favicon

* remove fall back to http get topology

* grpc dial option, disk total capacity

* show filer count

* fix each volume disk usage

* add filers to dashboard

* adding hosts, volumes, collections

* refactor code and menu

* remove "refresh" button

* fix data for collections

* rename cluster hosts into volume servers

* add masters, filers

* reorder

* adding file browser

* create folder and upload files

* add filer version, created at time

* remove mock data

* remove fields

* fix submenu item highlighting

* fix bucket creation

* purge files

* delete multiple

* fix bucket creation

* remove region from buckets

* add object store with buckets and users

* rendering permission

* refactor

* get bucket objects and size

* link to file browser

* add file size and count for collections page

* paginate the volumes

* fix possible SSRF

https://github.com/seaweedfs/seaweedfs/pull/6928/checks?check_run_id=45108469801

* Update weed/command/admin.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/command/admin.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix build

* import

* remove filer CLI option

* remove filer option

* remove CLI options

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

weed/admin/handlers/auth.go

@@ -0,0 +1,45 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/seaweedfs/seaweedfs/weed/admin/dash"
+	"github.com/seaweedfs/seaweedfs/weed/admin/view/layout"
+)
+
+// AuthHandlers contains authentication-related HTTP handlers
+type AuthHandlers struct {
+	adminServer *dash.AdminServer
+}
+
+// NewAuthHandlers creates a new instance of AuthHandlers
+func NewAuthHandlers(adminServer *dash.AdminServer) *AuthHandlers {
+	return &AuthHandlers{
+		adminServer: adminServer,
+	}
+}
+
+// ShowLogin displays the login page
+func (a *AuthHandlers) ShowLogin(c *gin.Context) {
+	errorMessage := c.Query("error")
+
+	// Render login template
+	c.Header("Content-Type", "text/html")
+	loginComponent := layout.LoginForm(c, "SeaweedFS Admin", errorMessage)
+	err := loginComponent.Render(c.Request.Context(), c.Writer)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to render login template: " + err.Error()})
+		return
+	}
+}
+
+// HandleLogin handles login form submission
+func (a *AuthHandlers) HandleLogin(username, password string) gin.HandlerFunc {
+	return a.adminServer.HandleLogin(username, password)
+}
+
+// HandleLogout handles user logout
+func (a *AuthHandlers) HandleLogout(c *gin.Context) {
+	a.adminServer.HandleLogout(c)
+}