FN-5807: add onboarding auto-launch hook before interactive commands

Ensure CLI onboarding auto-launch runs before interactive command execution when central DB is missing.

- Hooked auto-launch flow into bin.ts before interactive command handling.
- Added a dedicated onboard-autolaunch command module to detect missing central DB and trigger onboarding.
- Added focused CLI tests covering auto-launch behavior and guard conditions.
- Added a changeset for @runfusion/fusion patch release.

Files changed:
 .changeset/fn-5807-onboarding-autolaunch.md        |   5 +
 packages/cli/src/bin.ts                            |   3 +
 .../commands/__tests__/onboard-autolaunch.test.ts  | 164 +++++++++++++++++++++
 packages/cli/src/commands/onboard-autolaunch.ts    | 116 +++++++++++++++
 4 files changed, 288 insertions(+)

Fusion-Task-Id: FN-5807
Fusion-Task-Lineage: a12551b3-d8a4-492a-81f8-e92b4e138204

packages/cli/src/bin.ts

@@ -557,6 +557,9 @@ async function main() {
 
   const command = args[0];
 
+  const { maybeAutoLaunchOnboarding } = await import("./commands/onboard-autolaunch.js");
+  await maybeAutoLaunchOnboarding({ command, args });
+
   const {
     runDashboard,
     runServe,