feat: add app status tracking to the backend (#17163)

This does ~95% of the backend work required to integrate the AI work.

Most left to integrate from the tasks branch is just frontend, which
will be a lot smaller I believe.

The real difference between this branch and that one is the abstraction
-- this now attaches statuses to apps, and returns the latest status
reported as part of a workspace.

This change enables us to have a similar UX to in the tasks branch, but
for agents other than Claude Code as well. Any app can report status
now.

site/src/api/typesGenerated.ts

@@ -3060,6 +3060,7 @@ export interface Workspace {
 	readonly template_active_version_id: string;
 	readonly template_require_active_version: boolean;
 	readonly latest_build: WorkspaceBuild;
+	readonly latest_app_status: WorkspaceAppStatus | null;
 	readonly outdated: boolean;
 	readonly name: string;
 	readonly autostart_schedule?: string;
@@ -3307,6 +3308,7 @@ export interface WorkspaceApp {
 	readonly health: WorkspaceAppHealth;
 	readonly hidden: boolean;
 	readonly open_in: WorkspaceAppOpenIn;
+	readonly statuses: readonly WorkspaceAppStatus[];
 }
 
 // From codersdk/workspaceapps.go
@@ -3337,6 +3339,29 @@ export const WorkspaceAppSharingLevels: WorkspaceAppSharingLevel[] = [
 	"public",
 ];
 
+// From codersdk/workspaceapps.go
+export interface WorkspaceAppStatus {
+	readonly id: string;
+	readonly created_at: string;
+	readonly workspace_id: string;
+	readonly agent_id: string;
+	readonly app_id: string;
+	readonly state: WorkspaceAppStatusState;
+	readonly needs_user_attention: boolean;
+	readonly message: string;
+	readonly uri: string;
+	readonly icon: string;
+}
+
+// From codersdk/workspaceapps.go
+export type WorkspaceAppStatusState = "complete" | "failure" | "working";
+
+export const WorkspaceAppStatusStates: WorkspaceAppStatusState[] = [
+	"complete",
+	"failure",
+	"working",
+];
+
 // From codersdk/workspacebuilds.go
 export interface WorkspaceBuild {
 	readonly id: string;

site/src/testHelpers/entities.ts

@@ -913,6 +913,7 @@ export const MockWorkspaceApp: TypesGen.WorkspaceApp = {
 	},
 	hidden: false,
 	open_in: "slim-window",
+	statuses: [],
 };
 
 export const MockWorkspaceAgentLogSource: TypesGen.WorkspaceAgentLogSource = {
@@ -1371,6 +1372,7 @@ export const MockWorkspace: TypesGen.Workspace = {
 		healthy: true,
 		failing_agents: [],
 	},
+	latest_app_status: null,
 	automatic_updates: "never",
 	allow_renames: true,
 	favorite: false,