feat: complete release readiness work

- consolidate API ownership and remove dead vendor code

- add Stripe billing, learning paths, and public CV hardening

- add migration, recovery, security, audit, and browser gates

job-tracker-ui/src/LandingPage.authRedirect.test.tsx

@@ -31,7 +31,7 @@ describe("LandingPage forwards deep-link intent to /login", () => {
     mockedApi.get.mockRejectedValueOnce(new Error("401")); // /auth/me: not signed in
 
     render(
-      <MemoryRouter initialEntries={[{ pathname: "/", state: { from: "/jobs/42" } }]}>
+      <MemoryRouter initialEntries={[{ pathname: "/", state: { from: "/jobs/42" } }]} future={{ v7_startTransition: true, v7_relativeSplatPath: true }}>
         <Routes>
           <Route path="/" element={<LandingPage />} />
           <Route path="/login" element={<LoginStub />} />