feat(cli): accept https://claudemesh.com/join/<token> invite URL format

Pairs with claudemesh-2's new /join/[token] landing page. Users can
now paste a clickable HTTPS URL instead of the dev-only ic:// scheme.

apps/cli/src/invite/parse.ts — new extractInviteToken() handles
four input formats before handing the raw base64url token to the
existing parseInviteLink pipeline:
  - https://claudemesh.com/join/<token>   (primary, clickable)
  - https://claudemesh.com/<locale>/join/<token>   (i18n prefix)
  - ic://join/<token>                     (still supported, dev)
  - <raw-token>                           (last resort: bare base64url)

User-facing strings updated to the HTTPS form:
- cli help: "join <url>"
- install success message
- list (no-meshes) hint
- MCP server "no meshes" error
- README.md primary example
- docs/QUICKSTART.md Path A + Path B

Verified extractInviteToken() on all 4 formats — each returns the
same base64url token → same broker /join lookup.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/cli/src/commands/install.ts

@@ -185,7 +185,9 @@ export function runInstall(): void {
   console.log("");
   console.log(yellow(bold("⚠  RESTART CLAUDE CODE")) + yellow(" for MCP tools to appear."));
   console.log("");
-  console.log(`Next: ${bold("claudemesh join ic://join/<your-invite-link>")}`);
+  console.log(
+    `Next: ${bold("claudemesh join https://claudemesh.com/join/<token>")}`,
+  );
 }
 
 export function runUninstall(): void {