feat(FN-3396): bundle Cursor CLI as a plugin provider with dashboard auth w

Merges FN-3396's full Cursor CLI provider integration (Steps 1–4): defines a CLI-backed provider contract, adds the `fusion-plugin-cursor-runtime` plugin package with process management and runtime probes, wires dashboard auth flows and UI (ProviderCard, onboarding modal, settings), and bundles the

Fusion-Task-Id: FN-3396

packages/dashboard/app/api/legacy.ts

@@ -1339,6 +1339,19 @@ export interface DroidCliStatus {
   ready: boolean;
 }
 
+export interface CursorCliStatus {
+  binary: {
+    available: boolean;
+    version?: string;
+    binaryPath?: string;
+    reason?: string;
+    probeDurationMs: number;
+  };
+  enabled: boolean;
+  extension: null;
+  ready: boolean;
+}
+
 export interface LlamaCppStatus {
   enabled: boolean;
   extension: {
@@ -1407,6 +1420,10 @@ export function fetchDroidCliStatus(): Promise<DroidCliStatus> {
   return api<DroidCliStatus>("/providers/droid-cli/status");
 }
 
+export function fetchCursorCliStatus(): Promise<CursorCliStatus> {
+  return api<CursorCliStatus>("/providers/cursor-cli/status");
+}
+
 /** Probe llama.cpp server + setting + extension state. */
 export function fetchLlamaCppStatus(): Promise<LlamaCppStatus> {
   return api<LlamaCppStatus>("/providers/llama-cpp/status");
@@ -1671,6 +1688,15 @@ export function setDroidCliEnabled(
   });
 }
 
+export function setCursorCliEnabled(
+  enabled: boolean,
+): Promise<{ enabled: boolean; restartRequired: boolean }> {
+  return api<{ enabled: boolean; restartRequired: boolean }>("/auth/cursor-cli", {
+    method: "POST",
+    body: JSON.stringify({ enabled }),
+  });
+}
+
 /** Enable or disable the llama.cpp provider. */
 export function setLlamaCppEnabled(
   enabled: boolean,