feat: G15Office job, widget settings and submissions admin, embed.js and the settings importer

- SyncG15Office files each submission as a G15Office task with its screenshot through a fetchguard client limited to the configured host; a River job with 3 attempts, PHP's messages on failure, nothing sent when unconfigured
- the replay of PHP's recorded G15Office exchange (classes/testdata) asserts the task JSON, headers and the screenshot part
- settings screen (cabana field types only), read-only submissions list, manage_settings permission and navigation
- embed.js served byte for byte at /plugins/golem15/feedback/assets/js/embed.js
- feedback:import-settings copies the WinterCMS settings row once

admin.go

@@ -0,0 +1,82 @@
+package feedback
+
+import (
+	"embed"
+	"io/fs"
+
+	"git.golem15.com/golem15/sm-feedback-plugin/controllers"
+	"git.golem15.com/golem15/sm-feedback-plugin/models"
+	"git.golem15.com/golem15/summercms/modules/pact"
+)
+
+//go:embed controllers/submissions/config_list.yaml models/submission/columns.yaml models/settings/fields.yaml
+var adminFS embed.FS
+
+var (
+	_ pact.AdminAssets         = (*Plugin)(nil)
+	_ pact.HasAdminControllers = (*Plugin)(nil)
+	_ pact.HasPermissions      = (*Plugin)(nil)
+	_ pact.HasNavigation       = (*Plugin)(nil)
+	_ pact.HasSettings         = (*Plugin)(nil)
+)
+
+// AdminFS is the admin YAML: the settings form and the submissions list.
+func (p *Plugin) AdminFS() fs.FS { return adminFS }
+
+// AdminControllers is the submissions list.
+func (p *Plugin) AdminControllers() []pact.AdminController {
+	return controllers.AdminControllers()
+}
+
+// Permissions is registerPermissions: golem15.feedback.manage_settings for
+// the developer role.
+func (*Plugin) Permissions() []pact.Permission {
+	return []pact.Permission{{
+		Code:  controllers.PermissionManageSettings,
+		Tab:   "golem15.feedback::lang.plugin.tab",
+		Label: "golem15.feedback::lang.settings.manage_settings",
+		Roles: []string{"developer"},
+	}}
+}
+
+// Navigation is the Feedback menu with its submissions entry.
+func (*Plugin) Navigation() []pact.NavigationItem {
+	return []pact.NavigationItem{{
+		Code:        "feedback",
+		Label:       "golem15.feedback::lang.plugin.menu_label",
+		Icon:        "message-square",
+		Permissions: []string{"golem15.feedback.*"},
+		Order:       600,
+		Controller:  "golem15.feedback.submissions",
+		SideMenu: []pact.NavigationItem{{
+			Code:        "submissions",
+			Label:       "golem15.feedback::lang.submissions.menu_label",
+			Icon:        "inbox",
+			Permissions: []string{controllers.PermissionManageSettings},
+			Controller:  "golem15.feedback.submissions",
+		}},
+	}}
+}
+
+// SettingsCode is the settings screen's code. WinterCMS keys the screen
+// by plugin and code ("settings"); cabana keys it by code alone across all
+// plugins, so the plugin's own name keeps it apart from other plugins'.
+const SettingsCode = "feedback"
+
+// Settings is registerSettings: the widget settings singleton
+// (golem15_feedback_settings) on cabana's settings screen.
+func (*Plugin) Settings() []pact.SettingsItem {
+	return []pact.SettingsItem{{
+		Code:        SettingsCode,
+		Label:       "golem15.feedback::lang.settings.menu_label",
+		Description: "golem15.feedback::lang.settings.settings_description",
+		Category:    "golem15.feedback::lang.plugin.tab",
+		Icon:        "message-square",
+		Model:       `Golem15\Feedback\Models\Settings`,
+		Order:       500,
+		Keywords:    []string{"feedback", "widget", "g15office"},
+		Permissions: []string{controllers.PermissionManageSettings},
+		Form:        "models/settings/fields.yaml",
+		NewModel:    func() any { return &models.Settings{} },
+	}}
+}