feat(explore): add packages explore page

Implements public package discovery page in the Explore menu. Shows public and global packages with pagination, filtering by type, and search. Adds admin setting to enable/disable the packages tab. Updates package search to support PublicOrGlobal filter for showing packages that are either public OR global. Includes new locale strings and templates.

modules/setting/config.go

@@ -56,6 +56,7 @@ type RepositoryStruct struct {
 type ThemeStruct struct {
 	DisableRegistration     *config.Value[bool]
 	HideExploreUsers        *config.Value[bool]
+	EnableExplorePackages   *config.Value[bool]
 	HelpURL                 *config.Value[string]
 	CustomSiteIconURL       *config.Value[string]
 	CustomHomeLogoURL       *config.Value[string]
@@ -92,6 +93,7 @@ func initDefaultConfig() {
 		Theme: &ThemeStruct{
 			DisableRegistration:     config.ValueJSON[bool]("theme.disable_registration").WithFileConfig(config.CfgSecKey{Sec: "service", Key: "DISABLE_REGISTRATION"}),
 			HideExploreUsers:        config.ValueJSON[bool]("theme.hide_explore_users").WithDefault(false),
+			EnableExplorePackages:   config.ValueJSON[bool]("theme.enable_explore_packages").WithFileConfig(config.CfgSecKey{Sec: "service.explore", Key: "ENABLE_PACKAGES_PAGE"}),
 			HelpURL:                 config.ValueJSON[string]("theme.help_url").WithDefault(""),
 			CustomSiteIconURL:       config.ValueJSON[string]("theme.custom_site_icon_url").WithDefault(""),
 			CustomHomeLogoURL:       config.ValueJSON[string]("theme.custom_home_logo_url").WithDefault(""),

modules/setting/service.go

@@ -97,6 +97,7 @@ var Service = struct {
 		DisableUsersPage         bool `ini:"DISABLE_USERS_PAGE"`
 		DisableOrganizationsPage bool `ini:"DISABLE_ORGANIZATIONS_PAGE"`
 		DisableCodePage          bool `ini:"DISABLE_CODE_PAGE"`
+		EnablePackagesPage       bool `ini:"ENABLE_PACKAGES_PAGE"`
 	} `ini:"service.explore"`
 
 	QoS struct {