feat: service proxy, health monitor, hover card, and homepage section

Built-in service proxy with branch-based URLs, service health
monitoring, workspace hover card with service status, and
"Forget about ports" homepage section.

packages/app/src/screens/workspace/workspace-source-of-truth.test.ts

@@ -19,6 +19,7 @@ describe("workspace source of truth consumption", () => {
       status: "running",
       activityAt: new Date("2026-03-01T00:00:00.000Z"),
       diffStat: null,
+      services: [],
     };
 
     const header = resolveWorkspaceHeader({ workspace });